I watched Adrian Crendshaw's DefCon talk about how people got busted using Tor and have also stayed away since then. I have used it in conjunction with TAILS a few times, but other than that, I don't mess with it any more.
DEF CON 22 - Adrian Crenshaw- Dropping Docs on Darknets: How People Got Caught
DEF CON 22 - Adrian Crenshaw- Dropping Docs on Darknets: How People Got Caught
https://www.youtube.com/watch?v=eQ2OZKitRwc