Birdsong prices have went up a bit in recent months. AND....it can take a lifetime (or seemingly) to get a Birdsong finish. It's good stuff, but they work an individual gun in among all their contract work. I got a 1911 frame done in 3-weeks, but a friend waited for close to a year on a long gun. I will also say....that if you ever went there and dealt with those people in person....you'd likely never go back.
The Birdsong finish is good stuff and that's a fact IMHO. Whether-or-not in enhances the value of any gun is in the eye of the individual.