I've never used it because I kind of thought it was a weird cryptocurrency project. I honestly don't think it provides much value over Chromium + uBlock + uMatrix. But it's just another option.

I personally use Google Chrome, because I actually like signing in with my Google account, and I don't mind the tracking. I already use Google for everything: Gmail, Google Docs, Calendar, Analytics, AdWords, AdSense, YouTube, search. And Google Apps for my company. My choice of browser doesn't make a difference.