I ordered a Glock 40 to 9mm conversion barrel... it took some time but finally arrived. In my particular situation the barrel did not fit (the O.D. of the barrel was a tad too large - the slide was barely unable to close), I emailed them back with the problem and was told to send it back and they'd fix the problem. They did, the second barrel was perfect!
The customer service was awesome! (I thought I was going to get the run around). There was no crap to deal with in regards to importing paperwork. The only negative was the waiting time and paying in Euro's.
The quality of the barrel was in my opinion great, although I didn't have anything to compare it to. It looked very professional there were no visible/obvious tooling marks.
Would I order from them again? Definitely; they went out of their way to make sure I was happy - The barrel performed perfectly and was accurate. Communication was also great.