I won't speak to any specific site but as a general warning, when selling anything on someone else's site, the thing to keep in mind is that, as a seller, you are not important to the site. There are countless others ready to take your place. Their focus is on the customer and, should there be a dispute, they have a tendency to side with the buyer, which is the site's customer.
I've seen this on another site where a couple people have gotten ripped off by unscrupulous buyers. The buyer buys an expensive item, receives it and then claims it was "not as described." The site instructs the buyer to return the merchandise but what they return is instead a box of junk, not at all what the seller sold. Then, the buyer gets their refund from the site, so the seller is out the item and the money.
If such reports were isolated, I might well think maybe the seller is making it up, that they sent a box of junk and not what they indicated was being sold. But I've seen this situation described as happening more than once and to multiple sellers.
Sooner or later the site may catch on and ban such buyers, but that won't do any good for those sellers who have gotten ripped off in the meantime.
Most of the time, you won't have a problem though. And, if you were doing this as a business, where you're buying and selling all the time, getting ripped off by a few unscrupulous buyers is easier to absorb because of the volume of sales. But, if you're a small-time seller with just a few things to sell, getting ripped off is a big deal, especially if you're selling things because you need the money.
Just something to bear in mind since you'll be selling higher priced items. If you will be doing this on a regular basis, you may be better off because, as I mentioned, you'd be in a better position to absorb a bad buyer here and there. But, otherwise, proceed with caution.