my own experience with GLA left a bad taste in my mouth; i already had my regulator body from my brewing endeavors, so I only needed solenoid, needle valve, and I was really turned on my their slick-looking bubble counters. since they splash the word "custom" all over their website, I emailed them about just getting what I needed, instead of a whole assembly like is on their website. the email response was prompt enough, but somewhat curt. turns out they will not built anything custom. the assemblies you see on their website is all they offer. i emailed back asking about just purchasing individual parts, again a fairly prompt but even more curt reply. nope. I didn't bother emailing them again to tell them they are misusing the term "custom build" to describe what they do.
i don't doubt the quality of their product is good. (it better be for the prices they charge!) i didn't bother checking since I didn't make a purchase from them, but I would hope their return policy is good, too.
funny - after failing to get what i wanted from GLA, I too ordered a couple things from AquaCave! Even though they're not far from where I work, it's the opposite direction from home, so I just did an internet order and had it shipped. Blazingly fast shipping and great email communication about my order.