Jamie Passon's OD 833 is super beefy and, of course, fits like a glove.
Shafi Keisler's has one more gear, modern / smooth rail type shifting, and all tapered roller bearings - much less friction, quieter. In the 600 ft/lb version, I'd say strength is about equal to a red stripe (18 spl.) 833.
Kinda boils down to ya pays your money and takes your choice! I've run zillions of happy miles with each tranny.
