If I were going to get one of these I would personally get the one John mentioned, even though it has 2 hyphens to your one it looks tidier and is easy for people to remember exactly where the hyphens are rather than guessing
I would say reg-fee for this.
I would say that if you get a domain with hyphens then make sure they split up each
separate word, that way people will know where to put them if they know a hyphen should be there.
I-know-What-You-Did-Last-Summer.com is far easier to remember or explain over a phone than Iknow-What-You-DidLast-Summer.com
This is just me though, others may disagree but no one can argue against the fact that it looks prettier that way.