We drag race LS based cars throughout the Eastern US and have run most every major brand and the FTI has been the one we have NEVER broken and is cinsistanly a tenth plus quicker for a comparable specced converter than any we have ever used. This is not the occaisonal test & tune duty, but years of racing every weekend season long and many times doubled up. The others listed are great products and we used to standardize with the Yank & Vig's, but bet our wins on the FTI.
