I have had an 8500 X50 for several years. It's good and I've found it worthwhile. I'd be happy to answer any questions you have about it.

It and the Valentine 1 are the best detectors you can buy. You can't go wrong with either.

M80v2 | VP150v2 | QS8v2
SVS Pci+ 20-39
Emotiva UMC-1 & LPA-1
M22ti + T-Amp, in the Office