Here's my experience with a "blem" GBE 750 I bought from samedaymusic.com.
The amp shipped in the original box, but was missing the power cable; it uses the standard AC cable that is used for most electronic equipment, and I have a pile of them, so no biggie.
The cord for the footswitch was wadded in a big ball, not nicely coiled, but it was in good condition, so no problem.
The amp had clearly been racked, as there were screw marks on the aluminum face plate. I planned on racking it myself, so, again, no problem.
The biggest defect was that one of the amp handles was loose in the box, along with the screws that hold it on. One of the screws was clearly different from those used to attach the other handle, so obviously not original. When I tried to reattach the handle, I found that some of the threads in the handle were stripped. I also realized that the original screws were quite short, so they only went a short distance into the handles (which explained the stripped threads). I replaced all of the handle screws with new, longer, screws and now the handles are attached securely.
I've had the amp about 6 months now, and have had absolutely no problems with it. Considering I saved over $300 by going with a blem, and I got the full factory warranty, I'm quite happy with the deal.
BTW, samedaymusic said I could return it for any reason after I received it (shipping to me was free, though I would have to pay return shipping), so that made me more comfortable with the decision to buy.
