It seems like most people who have tried them all have gone with the Storm. I don't think there has been a Storm user who has switched to the PD, but many PD users go to the Storm.
I tried them all, I demoed some of them more than once.
First of all, every single one of them is more than spin-friedly. Spin on serves and groundstrokes is as good as it gets.
I thought the APD awkward shape was a deal breaker. It makes the take back for a one-handed backhand real odd. It's a very good playing racket, just too gimmicky for me.
The Pure Drive is a great racket. It's stiff and off-center hits do hurt, but that's old news. It's an extremely powerful racket. I think it is too powerful. It takes a real wristy swing to keep a low short-ball in. It's just too powerful, you have to hit tremendous spin to keep all your shorts in. It does serve extremely well, but the word is already out there on that. I really prefer the Pure Drive Roddick over the standard, by the way. The deal breaker on the PD is the stiffness. I won't use anything other than Luxilon strings and Lux and a PD combo would kill. I sometimes play 5 days a week and I don't think I could take it.
The Pure Storm is my racket of choice. I've hit with at least 20 other rackets and nothing I have ever used has come close. Spin is great, power level is perfect (especially with Lux), control is there, the frame stiffness (64) is right where I think it ought to be, and it has an awesome paint job! It's great on short balls, volleys (although a little slow to move around, but very stabile on volleys), heavy top-spin shots, and all types of slices. Serving is great too, I don't think Babolat makes a bad serving racket.
I disagree with adding lead to the Storm. I have experimented with that many times and always end up taking it away. Taking a good hard swing at the ball with as much racket head speed as you can makes this racket shine. I think it's perfect the way it comes. I've read that the women and people on the challenger circuit using them use them in their stock form, without lead. I am with them on that.
Anyway, demo them all and see what you think. Don't take my word (or anyone else's) for it.
Also, do a search on this website... There is tons of info on this racket from the last few months.