I don't own one yet, but that's most likely going to be my next firearm. It's a beautiful revolver with the ability to shoot 2 different rounds loaded all the way to the top, so what's not to like?
Personally, I would sooner buy one new since there's no way to inspect it and I'm paranoid when it comes to buying used firearms after hearing too many horror stories from folks who bought used firearms online, but if you have no issue with that, and confirm that it's in at least LNiB condition, then $700 is a steal seeing as they run closer to $850-900 NiB.