I received my STi Driver back from Bel this past Monday. After searching on this forum I was able to figure out how to check the revision number. It is an A7M9. So far I haven't seen anybody posting about this revision, so I thought it would be a good idea to put it out there and see what differences there are, if any.
I bought the unit used, called Bel when I saw the 3706 date code. The Bel rep. gave me a repair number and told me to send it in. No charge for it, although I obviously didn't offer that I wasn't the original owner. The repair slip says the repair was done "in" warranty.
A couple of things right off the bat I have noticed about this detector:
1. The mounting system, while obviously the Belscort X50 mount, is different. The STi has rubber bumpers built into the end of the detector. It really helps to keep it from bouncing violently, like alot of 8500s and X50s do.
2. The audio ramp up, to put it midly, sucks! There is none on mine. Here's an entire post about the audio problem:
I will put it through it's paces and report back.