Otherwise fantastic mouse marred by some issues.I've been a big fan of Logitech mice and this is my first non-Logitech mouse after quite a while.Where I come from:Logitech MX518, G100s, G402, G302. Out of the 4 mice I owned, all have met the familiar fate of button malfunctions.The MX518 has lasted me around 4 years. The rest 3 malfunctioned in under a year.I love Logitech for their innovation, absolutely loved the G302 for it's size, shape, weight, material, tracking & the clicks, oh the clicks, they're the best I've known; too bad it didn't last long. It's still by far the best mouse I've used, so this review is mostly based upon comparison with the Logitech G302Zowie ZA13The pros:1. Flawless tracking. The sensor is just superb. No acceleration, no apparent input delay. I love Logitech's delta zero tech, but this seems even better without any bloated custom software/drivers.2. No extra drivers/software needed. It's a big deal.3. Lightweight. Under 90 grams, very good for AWP flicks in CS:GO.4. Shape meant for smaller hands. Still not the most comfortable shape though.5. Sturdily built. Doesn't creak or rattle under any conditions, at least so far.6. Soft touch surface coating is great.7. Good placement of the sensor.8. Minimalist design. No blaring LEDs, sorry if you're fan of them.9. The cord is lightweight. Best that I've come across so far.10. Very good lift-off distance for lower sensitivity play.11. Extra pair of skates provided!The cons:1. I find the shape a bit too awkward for my taste, even for the smaller hands that I have. I've used the G302 which is probably the most polarized mouse for its shape and I still didn't feel that it was as awkward as the ZA13. My hand can't relax enough because the hump keeps shoving into my hand. Too bad I couldn't try out the other mice in the range (ZA11, ZA12) and went for the smallest, lightest mouse there was. May be the shape will grow on me with time. I'll update the score if it does.2. The right side fw/bk buttons are a pain, they mis-click often, especially with the finger style grip that I use, mostly when you're trying to lift the mouse with the pinky & thumb; a bigger inconvenience than it sounds like.3. The scroll wheel. It's mushy. It's awful. The middle click is alright though.4. The LMB & RMB clicks aren't the best, may be Logitech's crisp 'spring tension system' has set the bar just too high for me. I just hope they last longer than the Logitech's.5. The fw/bk buttons are just about ok. Once again spoilt by Logitech.6. Not grippy/angled(?) enough to lift it using the pinky & thumb.7. 20$ too expensive. I think the mouse is spartan enough to be had for around 40$.1