Positives
Can Change aggressiveness settings
Free (with real money deposit)
Finds seat automatically - just click attach and you're ready to go

Negatives
No Hand History
Odds disappear on your turn.
Recommendations seem conservative with default settings.

Overall
Pokerbility will give you an edge against the competition. While it does have some drawbacks, it is a solid piece of poker software and will only get better with updates.