I have a custom built BTE converter in my car and a BTE flexplate.. no issues as of yet..mind you there really isn't that many miles on my car yet or passes. so that's all the info i have at the moment..really not much.
Bill Taylor was the originator of TCI. When he sold TCI he had a no compete clause when that expired he opened BTE. I'm not sure if he is still involved with the business or not.