Started with a Nitek He ... didn't like it. The computer doesn't like deep stops, and didn't seem to like helium all that much either. Bent it about half the time I used it, trying to dive the profiles I felt comfortable with. Sold it and went with diving just a bottom timer for a while.
I'm currently diving a Liquivision X1. It likes the same profiles I like, since it uses the same V-Planner software I have on my home desktop for planning those dives. It's got a real intuitive interface, programming and switching gases is a snap, and I LOVE the bright OLED display ... especially in dark, murky conditions.
... Bob (Grateful Diver)