I have had a Etrex Vista for a year or two (has the Barometer/altimeter of the Summit plus WAAS, 24mb memory and mapping capability). It is a very nice and well built unit and I use it for hiking, hunting, and even mounted onto my Kayak. My only complaint is that when in heavily wooded areas it struggles to lock on to a signal. Not sure how this compares to other handhelds but I have heard that the antenna is the only weakpoint on the Etrex units. Just something to be aware of if like me you hunt in heavily wooded areas. The Rhino sounds good if you just want a good basic GPS though, it'll save carrying a seperate radio and batteries.