I have to say I have heard both sides of the story. You heard the positive above. I personally like the Persian Gardens for steams, hot lounges, etc.
But I have heard a fair number of people say they are not worth the extra money. The stateroom amenities are not substantial and BLU as a restaurant has the same menu as the other dining rooms (although I hear it is cooked a la minute). Plus, anyone can eat in Blu, not just AQ passengers.
The other amenites are an iPod player, fresh lemon water, aromatherapy, special pillows... (I am writing from memory, if I make a mistake feel free to correct me) and close access to the spa.
I love the Solstice ships, but if there is one complaint I have heard from a few people it is tht AQ is not as special as was advertised. If money is not a matter of concern them go for them, but if your budget is tight, then maybe not.