Thanks for your help!
What I was getting at was whether I could go back to editing the original timeline with the source files laid out. In premiere as it is a separate sequence you can always easily go back and tweak them if one isn’t quite in sync for example. What would annoy me is if I had multicam editing an entire show and realised one camera was very slightly out and I couldn’t go back and edit it.
I usually use 4 cameras on a shoot although I have sometimes used a couple more on big shows. I have been happy with premiere but I was looking more into vegas as one of my cameras is a sony sr12 which shoots in avchd. I haven’t been able to find the best way to edit this with my normal dv footage from the other cameras, hence wanting to look at Vegas, a sony product!