My understanding from a few friends who have been through it recently is that its not *too* painful. The worst part was trying to help the nice chap in clothing stores understand that Sqn Ldrs are not Phase 1 recruits and do not expect to be treated as such....
A direct quote from a friend "My expectations were pretty low, but it did meet them". Overall not as bad as it could be but there is inevitable faff and eye-rolling required after certain briefs.