That Mini Plex is actually a bit overpriced (it's not one of the more expensive Fargens). The VOS is going to be a cornerstone classic and I can't wait until I have that circuit in my Epic 30 DC (that amp's now discontinued).
I've played the Miniplex, Mightyplex, VOS, and Blackbird. The VOS is like a big fat plexi with more gain, reverb, and a tube rectifier. I'd love to have one, but the price is just too steep for me. I'm happy with what I've got, but the VOS would be my first choice for another amp.