Done 20+ over the years. Quality has varied from really good to oh well it goes bang.

The early Schillen blank barrels I had were by far the best. Most shot 1/2" at 100 or better. The Green Mtn units I had fouled really bad and were not as good as a factory barrel in my opinion. They are doing their own blanks now and I have seen mixed reviews. I started to order a Contender 44 Mag carbine barrel the other day and it was more than a complete Henry Rifle for the barrel so I just purchased a complete gun.
At one point they were a bit more inclined to make deals and work with cut off shorts. This made for some good bundles and good prices. Think that train has left the station.
If you order one let me know how it does.