I like the Rhino, but then it's because I hunt with my brother who has one too. To be able to see other hunter's position relative to yours is A-W-E-S-O-M-E!! I really like it for pushing game as you can coordinate drives when not in line-of-sight.
Of course, there's drawbacks. I bought the cheaper model without the electronic compass, and if you aren't moving you don't know left from right. Also, the resolution is useless for maps. No contours. Don't rely on ANY GPS. Always have a map and a compass AND AN EXTRA SET OF BATTERIES. I don't know about other units but the Rhino EATS batteries.
Juan