I don't have direct experience of their CPL training, but I have flown with WAC a few times for discrete bits of training I needed, and professionally spent a lot of time looking at them and meeting the staff before placing a large training contract.
They are majority owned by Cabair, but largely run separately (indeed, for the contract renewal, they were bid against by Cabair).
My experience is entirely favourable - the aeroplanes are well looked after, the instructors very dedicated and experienced, and the facilities excellent. Wycombe is not the cheapest place in Britain to fly, but they do a good job of keeping their own charges down. Personally I'd have no problem recommending them at-all for a CPL course on the basis of the knowledge that I do have.