Loved my trans from Brian too...that is until I lost 4th gear. A retaining ring was left out and caused 4th gear cluthches to burn up. Don't get me wrong, it was out of warranty but spent 11 months of the warranty period parked waiting an engine rebuild. After engine rebuild I found that I had no overdrive. Trans had less than 1200 miles on it.
I can't blame Brian for not helping me as it was out of warrantly. But I can blame him for a 2 dollar snap ring costing me ~700 bucks. Take it for what its worth, I'd go with one of the other builders on this site.