Injector.com (marren injectors) experince?

[1.2gees]

I've recently sent out 4 injectors to be rebuilt by them, and I have used this set for a few months, today as I take the intake manifold off, I see carbon build up on cylinder 1&4 which ofcourse leads me to check the injectors, sure enough 1 and 4 are leaking, and #1 is also leaking externally. I've been using these injectors @ stock pressure since the rebuild for about 3 months and less than a week @ 3 bar, which shouldn't make a difference...
I decided to get mine rebuilt @ marren because of all the positive things I heard about them (mostly @ rennlist), I'm going to send them an e-mail and see what they think shortly. Anybody else have anything to share or add?
Thanks
Ahmet