GA at Cardiff
We have been based at Cardiff (Southside) for many years and not experienced any problems.
Monthly charges are published on the website and include parking (outdoors only), approach & landing fees. We pay by monthly direct debit and from memory its around £200.
To gain Southside access you do need to apply for a renewable 3yr pass, which involves filling in a couple of forms (including a personal & professional references), applying for Basic Scottish Disclosure (done via the SD website at a cost of about £23) and need to have done the GSAT training (did mine at the airport, but there are 3rd parties that allow you to do it online, costing about £15).
PM/email if you need any more info.
Tim