Just started doing it this summer, so haven't had much time to compare growth rates, tastes, etc. Success rate looks to be about 50%, including ones killed during the surgery, ones that died later, and probably slips. Sounds awful, I know, but the learning curve is pretty steep for me. You learn something new everytime you do the surgery.
I've done just about every type of bird. I ordered an assortment of roosters, so have one or two of lots of different kinds, as well as mutts I hatched out myself.
Some types seem to do better with the surgery than others. The smaller the bird, the harder time it has.