For anyone interested, i've been running vegas pro 13 on a fully spec iMac 5K for just over a week now... i've completed 1 project, had a couple of application crashes here and there but generally it seems to be running stable.. Thumbnails in the media bin are a little small though, would be nice to see SCS introduce scrubbing over thumbnails like in Premiere CC and FCPX. Overall it's been pleasant experience.