It sounds like a great idea to me
as long as the input remains factual and not biased or full of innuendo and supposition.
ie: I bought "X", had installation problems. Called C/S, spoke with "B" who kept hanging up on me. Never got a call back and no response to me e-mails!! It's now been 2 weeks with no response and a car thats up on jacks!!
I looked at the other BOI and it doesn't seem that difficult to manage. I'm sure there are folks on board that will assist in that regard.
If you ever get paid supporting vendors, are you going to allow pros/cons on non-vendor items as well?
I know some sites will only allow feedback on supporting vendors items and they sometimes censor that to a degree.
Overall, I think it's a good idea