If you go by this test
Radartest.com The 8500 looks pretty good next to the V1.
Probably both are good enough and better then nothing.
I use a Passport 5000 (5 or 6 years old) and a CB radio. The CB warns you before the detector goes off. The CB is best on major roads. The locals use x-band here and leave it on all the time, so the detector still is useful.
