I have been using Linux since 1999, but I am running OpenBSD 5.6 on a couple of machines for a few weeks.
I downloaded & tested 5.7 yesterday by installing to pendrives, all seems to be going well.
(Next I will have to have a go at upgrading my 5.6 installations to 5.7)
Apart from some programs not being available, not much difference between Linux & BSD, so give it a go.

Edit: Just upgraded one machine from 5.6 to 5.7 - went OK as far as I can tell. :)
Edit2: Second box now upgraded as well.