I love my HTT s366 in the black truck. The only thing I wish I had done differently was to go non-gated and have a T4 flange. I had about 30k on the HTT before I added the trips, and it was flogged pretty hard with no apparent issues. It towed and spooled great. I should add that I put on some tow-flows at the same time as the HTT, and never had a spooling issue, but I am sure the tow-flow uppies helped with that. I can't talk about the Garrett's listed.
I like my HTT enough to be thinking about using a T4, billet, s366 in Emma when the time comes.