I've heard soundclips of them and many users are very positive about them. Construction wise they are very close to the original, allthough the difference is minimal so I doubt that really makes such a difference in sound. They are wound on the hot side but it's a custom shop pickup so you can get them as hot as you want, scatterwound and wax potted or unpotted. But this comes at a big price.
Yes, I liked the sounclips alot but I think you could get the same result if you had your stock Dyna's rewound by BKP for alot less money.