I have one of their Sea Service pistols. I got it because there don't seem to be any other options for such things, other than high dollar customs.
Overall, it's very poorly made, at least compared to what we are used to. That may actually be historically accurate, at least to some degree: the originals were not made with CNC machines. Regardless, they obviously are made by hand, and when you take one apart, you won't be impressed. Mine required a great deal of work, including cutting the springs and reshaping the sear to reduce the 20+ pound trigger pull, and reshaping the breech plug because it interfered with the touch hole. I understand that a lot of these guns don't need that much work, but that a lot of them do - and if you can't do it yourself, the cost of having it done can exceed the purchase price.
Having said that, I don't doubt the safety of them at all. I spent weeks going over all the online stuff and never found a single reliable report of one of these things failing during appropriate usage. I set mine up in sandbags, with 90 grains of FFFg, a tightly patched ball, and a string attached to the trigger, and nothing unpleasant occurred other than a ruined sandbag.
Short version: expectations may or may not be met, but unless you are a complete fool, I strongly doubt you'll blow yourself up.