Always had good things to say about Darren- know lots of people that have good service from him too.
Aside from Phil's problems I've not actually heard of him doing a bad rebuild as such, to be fair I've not heard many stories of bad Jabbasport rebuilds either.
G-Werks will give a good service and will honour warrantys providing you follow thier instructions, give Darren/Rob a ring I'm sure they'd happily talk you through it.
PSD and G-Werks have always been seperate entities, it was only in their younger business years they shared a unit.