Be careful when buying the Onzas. I ordered two of them last time, and both of the ones I got were NOT tournament edition. Woot said to RMA them at my own expense, which I find extremely annoying. I ended up giving them away. The only reason I bought them was for the adjustable tension, but those are on the TE only. One had a squeaky and clicky trigger, the other one had a loose joystick. I've bought refurb stuff from woot before; two mambas, an orochi, snf s lycosa. the mice all worked flawlessly, the lycosa was trash after a year from scissor switch wear and tear, and both Onzas were...well, disappointing. Maybe I just got unlucky!
Edit: As a side note, the triggers to me felt...uncomfortable. The buttons a bit...flimsy. The rest of the controller felt great. Overall still playable for $25, and assuming you do indeed get the TE is probably worth the money if you're interested. Both worked with no problems on PC. If you're on the fence, I say take your chances, buy one, and eat a few burritos less this week.
Edit2: You'll know if you got the tournament edition if it has a braided cord, adjustable tension joysticks, and the ABXY buttons light up.