I've been using this controller for about 3 months now, and It hasn't even begun to show signs of Drift. Normally with Pro Controllers (especially official ones) I start developing drift after 1 1/2 weeks. Plus it's $20 less than an official Pro Controller.
Only real negatives I can point out is that it doesn't have an amiibo reader, and it's Power-saver auto-shutoff timer is a little too short (5 minutes of inactivity and the controller turns off)