Cmon guys, the V1 is dated technology. If you're reliving the '90s, the V1 is suitable. IMHO, I think the V1 is over priced for what you get, mediocre performance. But if you're like me, living in California with CHP and local pd's using the latest in Ka band, and laser (Golden Gate Bridge), I'd go with the Escort 8500 X50. Side arrows are useless because radar is functional only on front and rear. Check out radartest.com and read the unbiased reviews. I have 2 escort 8500 X50's, one in my 996TT, one in my 996 coupe. I use a bel 980 in my X5 4.8is because the Ka sensitivity is outstanding. I have a custom installed K40 in my '04 E55 AMG. It's a piece of crap! The damn thing cost $1500 to install but it's not functioning properly. I might get another escort 8500 for the E55.