Whether a mod is worth it is all in the eye of the beholder. The same could be said for spending 500 dollars on an x or h pipe and get nothing but a different sound on a stock setup. At least with the TB you get the improved throttle response to go along with it no matter stock or not. Every mod is hyped so you will spend your money.
No doubt I do spend money on sound but going in I know that's all to expect, not 20hp/16fttq because no one is claiming that. It would appear that someone here is claiming huge gains for the TB.
Again, no wars - Just saying if it looks bad ass, gives you 6-10hp, that's great. Don't go claiming 20hp.