Who does Advanced RMA? I've had Advanced RMAs from Intel, ASUS, Corsair and EVGA before. A couple of them didn't even have an Advanced RMA policy but they still came through and delivered top-notch service.
And it's not on the honor system. You pay for the new incoming product, then they refund it when they receive the faulty product. It's essentially the same as buying a new product and getting a refund for the faulty one (usually companies won't do an advanced RMA if they will refund for faulty products, rather than replace).
In my case Koolance wasn't going to refund me for my leaking block or advance me a block under RMA. I'd have to take my system apart, put the air cooling back on, wait weeks, take the air back off, and put the "new" block on.