got the 436 and the HP1, to work pretty well, the digital distortion on my gre 500 and my pro 106 is major difference between the 436 and the HP 1. I like the GRE 500, just wish I could get it to work as well as the 436. I think it comes down to the firmware updates, i don't want them to get in my inventory, just looking at the inventory of useless scanners, that are no longer effective, guess it comes with digital advancement. pro 92, pro-95, pro 96 pro 2092, and then the bearcat 780 and the 250, series. anyone still using those. oldies but goodies.