TL;DR

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10 months on, and I've replaced this mouse as I dislike it so much.



This mouse annoyed me for 10 months. Razer clearly have little idea about hardware design, but boy do they understand marketing. Warning: about 50% of the purchase price apparently contributes to the packaging this thing came in (plus stickers ... oh wait, I'm not 10 years old).



Pros:

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Note: I have medium to small hands with quite slender fingers.



The circular arrangement of the thumb buttons works quite well, giving plenty of options that you don't have to hunt for in the heat of the moment.



The Synapse 2.0 software gives a great amount of configuration for all the buttons, with the ability to have per-program profiles, and pretty much do anything with any of the buttons. They've done a great job with making it as flexible as possible.



Cons:

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If you rest three fingers over the two buttons and click wheel, with your fourth finger on the rest there are a few gripes I had:

a) it feels a little crowded (and as mentioned, I have relatively small hands)

b) the two main buttons are quite sensitive. In this configuration, I found that the right mouse button was FAR too easy to click inadvertently.

c) you have no real grip on the mouse so you won't be able to pick the mouse up to recentre it on your mat



The mouse feels a little short, such that I find my thumb moves forward from the rest at the centre of the cluster of side buttons and can hover over button 2 instead.



I have found that about 50% of the time after powering up my computer either from fully powered down or from sleep mode that the mouse has needed to be unplugged and replugged which is getting very frustrating. On these occasions Windows 7 complains that it has been unable to install the driver (although it is correctly installed and works without this error the rest of the time and as soon as replugged). I've also had this happen when using it via a KVM switch.



I spent some time creating a profile which after about a week of use suddenly disappeared. This is in spite of the proclaimed "cloud storage" of said profiles, which is ironic. I've not had such a feature with control devices before, and have never randomly lost my settings. My conclusion is that the theoretical gain in having cloud storage actually just introduces an unnecessary complexity which is more likely to crap out on you.



Update 1:

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After 6 weeks of daily use I can also add to to the list of negative points the fact that the cursor will suddenly move to the extreme of one axis. I have observed the cursor in windows move rapidly to either the top or the left of the screen with no corresponding mouse input. I've also had this in first-person gaming using "mouse look", where the view has suddenly gone skyward (eg mid battle in Skyrim I've suddenly found myself looking at the sky).



Update 2: 8 months in

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Replacing this mouse. It annoys me daily. If I could afford to blow £60 more frequently it would have been replaced months back.



Update 3: Sep '14 (10 months in)

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Replaced with a Corsair Vengeance M95 - couldn't be happier (unless I'd not wasted the money on the Razer Naga Hex).



Conclusion:

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Don't bother.