Any Experience with Wikidot?

So, some associates and I are working on a project where a wiki might be handy. Wikia, though, doesn't allow for privacy, and none of us really have the means to set up our own server to host a private one (and for some reason just putting things in Dropbox isn't really an alternative, don't ask). Googling reveals Wikidot to be free and have privacy functions. Anyone have any experience with it? Pros, cons, pitfalls and the like? It's not a scam I'm unaware of?