Pokertracker and Gametime + questions

Hey, I've just recently purchased PT and d/led GT+. The thing is, I'm playing the micro-limits right now on Pokerstars. Ive tried to import hand histories from stars, but it wont work. I believe I read somewhere that PT doesnt support histories from star's ring games yet, is this true? Also, what are the differences between GT+ and PokerAce HUD that make PA worth $25? Both probably stupid questions, but keep in mind im new to the online game.