I went ahead and bought the Aeris AI, with quick disconnect and compass. It`s great so far. It doesn`t have a manual shut off, which is annoying, but I guess I understand why. I love the wrap around design and compass attachment, makes it REAL easy to navigate underwater while keeping track of all the vitals (direction, depth, air). It`s also air integrated (which I guess the "ai" in the name stands for...or else that means "artificial intellegence"). Air integrated means a much better dive profile. It measures altitude, depth, temp, time AND breathing. I bet soon they`ll have wrist mounted wireless computers that also measure your heart rate with inputs for your weight, % body fat, age, etc. All that will help to really calculate your dive profile.