As I said before (and dozens of times in the past) PG's stuff is sold through BEA in the states and Mike is much easier/better to deal with.....you really don't need to know anything else!
as far as the parts themselves, some are good (most, I'd say) although it's certainly hard to beat the original stuff. Some is not (i.e. the ramcharger duct which Mike was upfront about with me) Overall I'm happy with the vast majority of my purchases and I've very happy with Mike's customer service.
Dave