I'm in Phantoms right now, and I love them. It took a bit to learn how to spin in them, though, as it was a change from what I was in. I started in Coronation Aces, then went to Visions and finally to Phantoms. I'm in my second pair of Phantoms.
However, Phantom is a LOT of blade. I like the aggressive pick, but I'm pretty big in general (tall for a female skater, overweight, and have larger feet). I think Aces and Visions are great blades for entry level through low doubles, and really higher doubles as well depending on the skater.
I'm NOT a fan of the parabolic, but that's just me. I didn't see much (if any) advantage and don't see the point in spending the extra money.