Clearance instruments should be returnable. Saw one return due to weight not being accurate on a Tribute in this thread. I also know first hand that they warranty them. My B-Stock Kilo 5 had a neck replacement within the first few months of me owning it. Warranty was very easy to get approved and everything went well. Worst part was wait time for replacement, but they hit the target that they communicated to me, so no real complaints there.
On some of the instruments they sell, I would not worry too much about returns. If it is defective, use the warranty. If you do not like it, sell it and get more than your money back (at least on the US ones at the current sale prices that they have).
Edit: You can also pay with PayPal which would offer buyer protection should you end up needing it.