I use Poker Tracker and PA HUD. I wouldn't ever want to play with out it. I like Poker Tracker, because I can review my HH's and all kinds of stuff. Also PA HUD displays the mucked cards the very next hand which is so awesome when your Multi tabling. To be able to see some donk keeps betting into you with nothing is just the best!! ( I know you can use the HH provided by stars, but the PA HUD is so fast)

It's $25 for PA HUD right? What a deal!!