Are "Used" Revel Studios worth the money??

I'm a big Revel fan, and have listened to the Salons, the Studios, and the F-30s pretty seriously. I think that each step along that price progression makes sense, i.e., that there is good reason for the Studios to cost significantly more than the F-30s. I think the price difference between the Gems and the F-30s is much harder to justify on audio-relevant (as opposed to cosmetic) grounds.

Depending on the amount of money you are talking about, pre-owned Revel Studios, in my opinion, are definitely worth the money.
I own a set of Revel Studios, that I bought here on Audiogon. I upgraded from the F30's, which are also a good buy.
The Studios can be a little finicky on their placement, and can be a little bright, depending on your power source, and your room. But they do have high end adjustments for the tweeters. I have also experimented around until finding the right speaker cables; Audioquest Calderas, biwired, seem to work well, compared to the Audiotruth Sterlings that I was using; and that also made a huge difference.
I am using them, now,with a pair of Levinson 33H monoblocks, and a Wadia 861 cd player, and they perform wonderfully.
So my answer to your question, within reason, is "Yes".
Hope that helps.

I also bought a used pair of Studios and think they are wonderful. Not fatiguing like most super accurate speakers, they are so smooth and natural.

And hopefully, with a modicum of luck, I will get to hear Mike1diver setup in a few days. He is a nice guy and definitely talking straight. More audio here in TN than you could believe.