Are these any good ? I've been offered a part worn set (6 months use) for £750.

the set-up is quite good.....maybe not up to AP, but plenty for road & trackday use...........
the only downside to this kit is the 1-piece std discs which are stupidly expensive and only available from Subaru!! (i'd make some enq's first to set your mind at rest)
we have also found that the subaru pads (all Ferodo options) can exaggerate disc wear in this application and Pagid rs19 "yellow" is a far better all round pad
hope this is of some use
alyn - asperformance.com