I got a 530 last year (US model). it seems to run OK by itself. However I ran into occasional problems on last year's moose hunt when I had it running in conjunction with a 130 (Canadian model) used by another hunter set to the same frequency. Problems were the screen freezing or breaking up, or the volume going to zero so i couldn't receive calls. While I could reset the volume when it went to zero, for the other issues I had to turn the set off and on. The annoying part is the problems were intermittent.
Other than that I really like the unit- the peer to peer positioning works like a charm and the unit boots up really fast, I find it easy to read. if I can solve the issue when talking to a Rino 130 it would be perfect.
Some of the accesories are not the greatest. the neck lanyard separates too easily, and the dashboard mount cradle doesn't allow you to run a cigarette lighter power source.