Other activity trackers and systems for keeping organized have always stressed me out a ton. Qbserve is the first activity tracker i've used that i don't feel hung up or bad about using through the entire cycle of use. There are periods where i will stop tracking for a while, but Qbserve is always easy to jump back into and use. You get immediate feedback about what's going on, and the color tracking in the dock icon gives a great visual feedback mechanism as a reminder for how on track you've been (or not).
Classification has gotten better, and the ability to triage stuff yourself is great. I wish there were some way to segment up my twitter use into work related, and time wasting, but that's my only complaint.