For the most part I like Blackstar. My Blackberry is my only GPS unit. It allows pretty easy paperless caching for me. The GPS is not perfect but does a pretty good job of getting me within + or - 10 feet of GZ most of the time. I load up .gpx files and get all the hints, and logs on the unit. Then if I'm someplace I have good phone coverage I can even right my log and upload it on the phones browser. Works well enough for me.