I use this mouse at my desk for normal work and browsing and i love it.
It's plug and play, it has settings that match my exact preference and the wirelless has a long range, more than 4 meters.
I keep it on the Lo setting for normal use and it works flawless but it has a Hi setting for gaming also.
It's dimensions are perfect for my hand, not to bulky, not to small.
The clicks are decent, not silent but not too loud and the scroll is almost silent with notches.

I use it with a Logitech MX Keys Advanced keyboard and they look great together. Overall it is a perfect mouse for my need.

All of these mice have a scroll wheel that fails and starts to scroll backwards.

~10 months of light use for a premium mouse is pathetic.

No option to return to Amazon even though Amazon are responsible under UK consumer law.
Supposed to be a 2 year warranty.

Won't register with logitech, valid serial number but will not link to my account.

If you consider computer mice consumable and don't mid paying £70 every few months then this is the mouse for you. Otherwise, buy something more durable with an actuall warrenty.

I purchased it for the bluetooth and being able to use it with multiple machines. But I found it a little heavy, even with one battery. The final straw was that there is a sharp edge just above the mouse wheel and I kept catching my finger on it, so I've gone with another mouse.

Lasted about 20 months then the dreaded constant double-click failure happened, apparently I can't get support here on amazon although that's where Logitech says I should go for issues.The mouse was very well looked after.Ever tried being productive or gaming on a mouse which double-clicks every other time?It's the most annoying thing and causes a whole bunch of problems.I thought buying a premium mouse meant longevity but silly me I guess.

I like everything about this mouse. The size, shape and design are all great. The battery life also exceeds anything I have seen before and I haven't had to change the batteries in the year I have had the mice.

Unforautnely, I have been throught two mice and both have had major issues with their scroll wheels.

The first unit failed after 5 months and resulted in double/triple clicks whenever the scroll wheel was clicked.

The first unit was prompty replaced, however the second unit failed after 4 months however the scroll wheel broke completely. It simply stopped clicking and was instead smooth, however this also meant that scrolling didn't work at all.

Amazon was great at replacing both units and agreed to refund me after the second failure. Despite loving this mouse, I would suggest you stay well away as I am clearly not alone with these scroll wheel issues.

Everything about this mouse is perfect, couldnt ask for anything better. My aim improved the same day I bought it. I also like the way it looks, I'm not a fan of crazy RGB stuff. Also very easy to clean it doesnt have a bunch of gaps where dirt can get stuck. Battery life is crazy good I game 5-10 hours a day and after 2 months the battery bar hasn't even moved.

Always been put off wireless mice as it's just a faff having to bother with batteries, but especially with the lightspeed sensor battery life isn't really an issue now. Very light, ergonomic and other than wanting fancy macro buttons or RGB i don't know why you'd need much more than this. Highly recommended.

This mouse is superb. It’s comfy, accurate and has a quality weightiness to it. In fact, at first I found it too heavy. To the point that my RSI starting playing up. It was at this point that I discovered that the mouse will work perfectly well with only 1 AA battery installed, which solved the problem.

The mouse has 2 settings, Standard and High Speed for gaming. I don’t game on my PC so standard is good enough and I must say, better than usual Bluetooth mice.

Overall I am extremely impressed and have found it a joy to use. I REALLY won’t to try the partner keyboard, Logitech G613, but I can’t find a UK spec one anywhere.

Edit: So after using this mouse for sometime, I can tell you it is trash for gaming.Sure if you play Peggle and the odd strategy game, or even slow places fps it might be doable, but the input lag is so big for fast paced games is unusable.Anyway who says its great for gaming.... isnt a gamer

I loved it so much I have recommended this mouse for others.The main feature I like is the option to switch between Bluetooth and wifi, it means with a push of a button I can control my PC and then switch to controlling my Nvidia shield.In addition to this the dongle "just works" on my LG TV (same with the keyboard from the same range).

In regards to the mouse, it is not too heavy, you can make it a bit lighter by only installing one battery at a time if you desire.The sensor might not be a pixart sensor but it seems responsive non the less.I use it in high performance mode, and battery life is still good.

So I bought the g603 as I currently have the g703 and wanted something similar I could use across multiple machines.

Shape wise it is very similar.It takes two batteries instead of being rechargeable though and I found the weight 'off' and coincidentally its not adjustable.I cant put my finger on it but the mouse felt 'off' to me and so for now I ahve stuff with my g703.

Given the price point I would expect a few things on this mouse:

Rechargeable battery like the g703.
Support more than 2 hosts.It needs 3.Like the MX Master 3.

Dont get me wrong, as a portable office mouse its ok but its all a bit to general and dull feeling whihc is a shame as it bills itself as a gaming mouse.Its got a great sensor (hero sensor) that is accurate and responsive and it links in with the other gaming products through the ghub.

However for me it feels like they have taken a general purpose mouse and tried to give it a lick of gaming paint.The much much better proposition at this price point is the g703 in almost every way but the g703 lacks the abillity to connect to a second device making it gaming exclusive.

For my mind logitech just need to add the abillity to connect the g703 to other devices and those who want their primary mouse to be gaming one also have the option of using it with other devices.The g603 attempts this but lacks all of the extra features of the 703 and feels dull to use and in hand