@Julian ********
it's hit or miss, it was closed for a while not that long ago while they hashed out a new company that takes you thru no-manz-land. Now that that's sorted out there're ok again for bouncing out and back in.
Although AFAIK they will NOT let people from the countries that get 90 day visa exempt entries bounce out and back in there, only people who get 30 day visa exempt entries OR who are activating another entry on a valid multi-entry visa.