Here's my personal experience with Q-Rack.
I ordered a rack from them and they quoted a price, with a credit for a carcass turn-in.
1) During my emails with Tibor, he stated that since I lived in the US and the shipping/customs, etc, might not make the carcass turn-in worth all the B.S.; that he would use one of his existing rack carcass housings for rebuild and wave the turn-in requirement (i.e., turn in pricing with NO turn-in)...Pretty damn good if you ask me.
2) It took a little longer than their originally quoted timeframe to complete the rack build because one of their parts suppliers delivered gears to them (if I remember correctly) which were not of proper finish/quality. They had rectified the problem, switched manufacturers, and as a follow-up quality test, disassembled/reassembled my Q rack using the new part(s), tested the rack in their own car to validate proper operation, and then shipped the completed rack assembly to me in the USA. This was in June, 2011.
I have a 2003 WRX with existing PS pump assembly and no issues.... It is an AWESOME product and I have nothing but good things to say about their customer service and quality of work.