Pros: Small, light, extra buttons, rubber grips, decent sensor.
Cons: Weird shape, creaks under pressure, mouse button bug.
Size & weight
The mouse is tiny (9.5cm x 6cm according to the website), and as you can see from the photo, has an unusual shape. It is Roccat's original design, I don't believe any other mice look like this. The shape is ambidextrous, with a single extra button on each side.
Roccat Pyra is also very light. The official website states it weighs 90g, but when I weighed it without the wire it was only ~62 grams. I assume the wireless version is heavier due to batteries.
I thought it would suit me since I use fingertip grip, but the shape took some time getting used to (there's no support for ring finger as in ergonomic mice I used before), and it's almost too light for me. Still, for fingertip grip users who want the lightest mouse possible, Pyra is a decent choice.
I should explain the "creaks under pressure" part I listed in cons. When I grip this mouse strongly it creaks which makes it feel flimsy and cheap. However, I don't think that means it will break anytime soon - it's just built this way.
Pyra has the standard buttons + wheel, and two extra buttons on the sides. The main buttons are extremely sensitive and definitely took some time getting used to. Still, I see no problem with that. In contrast, the wheel button is very hard to press, and also loud. The side buttons are pretty much perfect: you won't press them by accident, but they definitely trigger easier than the stupid middle button.
The wheel seems nice, it gives an audible 'tic' when scrolling, and gives enough resistance so I wouldn't scroll too far by accident.
The extra side button on the right is hard to reach (if you're right-handed) since you have to use your ring finger or even pinky, which are normally used to hold the mouse if you are fingertip gripper. In other words, it's pretty useless. You can basically consider this mouse as having 3+1 buttons, as far as gaming is concerned.
According to OCN's reference thread, Pyra uses the PixArt PAW3305DK-H optical sensor: same as Kova+ and SS Kana. There's no prediction. Lift-off distance on my QcK+ was around 2 CD or lower. So, no issues there. I haven't been able to reproduce the "jump bug" that this sensor supposedly has, either.
This mouse has drivers and on-board memory with up to 5 profiles. That means you can save your settings on the mouse and uninstall the drivers if you wish. Settings include programmable buttons, sensitivity, and DPI. USB polling rate is fixed at 1000 Hz and you can't change it.
As mentioned before, I haven't experienced the dreaded "jump bug". However, my Pyra seems to have a different bug related to mouse buttons. When I'm holding down LMB (say, shooting continuously in CSS) the game suddenly thinks that I've released the button for a half second or so, and then picks up again. But I'm pressing the LBM the entire time. This happens maybe 1 out of 100 times. I've never seen this problem reported so I'm guessing my unit is faulty and it's not a problem of all Pyras.
It is a decent fingertip grip gaming mouse that I've also reviewed here. I haven't experienced any big issues besides the said "button hold bug". However, I can honestly say it is too small and light for me. Next time I'll be looking at slightly bigger mice with an ergonomic shape rather than ambidextrous.
If the very low weight and size don't bother you, you might want to give Roccat Pyra a try
P.S. there is a forum thread here on OCN where more Pyra owners have shared their reviews: