Couple of comments. First, I have an early PTR-91 and it had problems.. sent it back to JLD twice. However, they were courteous, professional and relatively quick on the turnaround. They got it right on the second trip, and it's been running fine. I also have a tight trigger pack after that trip, none of the looseness it originally had. Given that I've had issues with other firearms I've purchased (ParaOrdnance and Taurus), I have something to compare the service to. (They weren't as good as PO's service, but they were a million times better than the no-service I got from Taurus, but that's another rant)
It's a good shooter for the price, supposedly better than the Century stuff, but I have no comparisons, only all the hearsay I read while researching my PTR purchase. However, if you want a build, everyone says call Jayson at IGF (http://www.investmentgradefirearms.com/). Again, I have no experience with his work, I've just seen a lot of pics from many happy customers - never heard anyone say anything bad about him. And on the internet, that says something. :)