I’ve got an 8500, had it for about 6 years. I know it’s not the best detector any more but it’s given me more heads up than I can count over the years. Looking back i should have spent the extra $100 on a v1, but I’m not fast and furious that much so the 8500 does the job still.
My advice is you pick up anything “upper echelon”, even if you have to look for a used unit.