I'm doing the 3k (paid for, sadly, as I'm relaying on the bike, not marshalling).
I don't think there's going to be much biff in these races, as there will be far fewer participants than on Sunday. I've done the short swims on the Saturday as a practice before both previous Outlaws, and it's never been tricky at the start. Actually,come to think of it, it was tricky at last year's start, but only because I was still getting into my wetsuit about 30 seconds beforehand
. I'd recommend it if you can do it free!