That's a good question - and (based on my experience with damaged deliveries from them) would very much depend on you being an International vs. US-based customer.
For returning, US customers are probably not an issue, but it gets more convoluted as an International customer . . . you have to pay to ship back to them and they give you BBTS credit.
Fortunately, with the 4 or 5 items (out of hundreds over the last 20 years), I've either accepted replacements at BBTS's cost (because they were available), OR a complete refund, OR a partial credit (they are much more generous with that than Sideshow are!)
So - for EXO-6 pieces, that (at BBTS) sometimes sell out and sometimes don't, you have to take the risk that something MAY be wrong with an item, and BBTS may not have a replacement to send you. That being said, I've had no problems with ANY of the EXO-6 pieces I've got from BBTS (6 delivered so far, 3 on the way).
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