Newby here. I drive a 05 M3 and currently have a Beltronics V955 which I bought used in 2007 for like $50. It's in need of a firmware update because it falses constantly on the highway when I'm next to certain cars. I believe it's $100 for the firmware update but I think it may be time to upgrade. I'm currently researching between an Escort 9500ix, Escort Passport (newest one), Escort Redline, and of course the Valentine 1. I know the basics (but please correct me if I'm wrong).

9500ix: great for city but there's no speed cameras where I live and I don't run red lights. Decent off axis.
Passport: supposedly same as the 9500ix but less features. Decent off axis.
Redline: best in the market for highway but falses more than the others above during city. Amazing off axis.
V1: very sensitive, chatty, but is that only for older firmwares? I heard the new firmware of the V1 falses as much as the GPS-featured 9500ix. Amazing off axis.

Originally I had V1 off my list because of all the false alarm reports and reviews, but it's back in it again. The V955 hasn't failed me and works just fine. So paying the $100 may also be an option. Just need to read more into these RDs. In the future, I'd like to purchase a Laser Interceptor kit but most cops in South Florida and Orlando use Ka. I've only been hit with a LIDAR once and received a ticket because of it.