Hi chris,
Yes it is No 6
I'm over here in the Uk flying for VS. I'm an Aussie, but not on the exchange - although every single person asks me "Are you on the exchange?"
Anyway, from discussions with current DJ exchange crew at VS, it is actually a pretty big comitment. Our salaries are fairly low over here, and the cost of living is much higher. But the trips are usually pretty awesome, as are most of the crew.
There are a few issues:
You are not eligible for staff travel in the first 6 months.
You no longer get promoted to Senior after 6 months.
No support is provided in setting up your life, so be prepared!
Accommodation, Transport, NI numbers (like a Tax file number), bank accounts etc etc... Just be prepared.
But lots of crew really enjoy it, one I flew with a few months ago was on exchange 4, and loved it so much, he stayed!
Just try and save up as much cash as you can, so that you can have a little more spending money than just your allowances.
Good luck with you're application!