My wife and I both have Oceanic AI units. Hers is a Datamax Pro Plus (hose), mine is a VT Pro (hoseless).
Here's what I like about are units:
--BIG numbers, easy to read underwater (esp. since I wear reading glasses).
--Very simple screens, with limited data. Easy to scroll through other info. if you want.
--I LIKE the bar graph NDL info. I find this much easier to interpret for "decompression" state (how close am I), and allows me to quickly adjust my dive profile..
--Units tend to be durable, and you can change the batteries yourself.
--The factory has always been very good in supporting us.
BTW, Oceanic, Aeris, and Sherwood are all made by Pelagic, so they're essentially the same units...