In reply to Andy Gamisou:
Hi Andy,
Yes we have. Moving wasn't too hard although I never had to perform a live migration, it was obvious just a lot of work ripping apart and replacing existing database. We were also initially on SQLite.
There are a few things to consider before moving, one issue in particular that had I realised up front and been able to foresee the problems it would create I'd probably have looked at other options.
I'll fire you en email in an hour or so.
Cheers