From my experience they are very good. They are very professional, this is probably because of strong links with the airlines.
The staff are all very experienced in the aviation industry, flight and ground training.
Efficiency is good, correspondance is always prompt. They have a very good first time pass rate for ATPL's and I belive are in the process of improving this further with the use of new ATPL manuals.
They seem to have structured the course to cater exactly to what the airlines want so have included things such as structured hour building and airline prep. In order to enrole I believe you have to be apptitude tested by GAPAN and score well (recommended before you fork out £40K!), and also hold a class 1 med, as well as the usual interview.
Prices are competative and I have not learned of any hidden costs. They can offer some form of help with getting loans etc..
On the negative side the are not that well established or developed yet, but at their current rate that will change very rapidly
Overall I think PAC to be an efficient and proffesional school with not to many students (a good thing), and a good reputation for airline placement.
Best adivice - give them a call, they are very helpfull.
Hope this is of use