oldham

I've read the odd thing on here about Subaru standard brakes not being that great I'm looking at buying my mate STI v2 off him, just wondering how the brakes compare to my 323 bmw. Are the sti brakes betterthan standard? How much money am I looking at to impove the brakes. Will I feel I big difference as the breaks on my 323 are pretty sharp. Just waiting to have a go off his car really.