My one concern about the AI is that, if you get really into diving and especially if you start looking at more technical diving, you may reach a point where you want/need the computer to be on your wrist and want your SPG to be as streamlined and small as possible. That said, for the strictly recreational diving that most do, the AI will work well and you won't have spent a lot of money if you decide to sell it and get something else later. Just be sure to secure it to your BC, since you don't want your air/NDL monitor to be hanging loose and risking damage by banging into the bottom.