Work Capability Assessment for new claimant

Hello everyone,
Just wanted to ask, has anyone on here had experience of the WCA? I know a lot of you have had the experience as part of a move to new benefits from old entitlements, but I was wondering if anybody had been for one of these after being signed off sick whilst on Universal Credit? Or, is it the 'same animal', as the burgeoning 'assessment' long term disabled claimants have to endure? As always, I'd be very grateful for any help
Baz