I went with the Beltronics RX-65. It was a little less expensive and it has been very good to me in reminding me I may be going too fast when driving my Xfire. While there is no system out there that is fool-proof, the RX-65 has given me plenty of notice when radar waves are on. It has also been very good at letting me know when instant radar is sent in my direction. At least 2 times, I was already pulled over before the officer got turned around. I don't see how a more expensive unit would have performed any better.