The main advantages to having an AQ cabin IMO are: 1) dining in Blu, 2) free access to The Persian Gardens, and 3) receiving two cruise credits for a 1-week cruise. The value of the in-cabin perks were less important to us.
Are the AQ amenites "worth it?" It all depends on each person likes and dislikes, and to the costs of an AQ cabin vs. what other cabins classes you are considering. For us, we upgraded from an already booked CC2 cabin to AQ for $200; well worth it to us.
05/89 NCL, Seaward, 1990 Carnival, Topicale, 1991 Carnival, Festivale, 11/93 Wind Star, Wind Song, 01/95 Celebrity, Horizon, 01/96 Celebrity, Century, 01/00 Celebrity, Zenith, 01/01 Princess, Ocean Princess, 01/02 Princess, Ocean Princess, 01/03 Celebrity, Summit, 05/04 Princess, Diamond, 01/05 Celebrity, Galaxy, 01/07 Oceania, Regatta, 01/08 RCCL, Voyager of the Seas, 02/09 RCCL, Voyager of the Seas, 01/10 Celebrity, Solstice