Went there a few months back. Its ok, it was nice to see a A1000 in the plastic. Space Invaders was conked out when i was there which kinda miffed me and Pacman was MsPacman...
I did kind of walk away preferring my own collection of retro machines to be honest!
I have to admit that a retro computer convention organised by genuine retro gamers with genuine retro machines running would be most amusing.