I just took the HM2 HUD out for a spin. It looks really ace, but there are a few bugs it seems.
* At some point my stats on myself reset to zero. At that stage I had played over 30 hands at the table. It seemed to function ok after that.
* With more than one table open I seemed to lose the ability to open the pop-ups fairly frequently on more than 1 table.
* I lost HUD stats on one player altogether at some point although he remained seated at the table. I can't recall if they came back or not.