Go With Spectre
As far as I can tell, it does what it's meant to. I put this on before I put on my Spectre cold air intake to test it and noticed an immediate throttle difference, definitely added some power. And it hasn't messed with my mass air flow sensor. Don't buy this to save gas though, I haven't noticed much of a difference. Wasn't too hard to install either, just make sure you have a socket set and a pair of vice grips at least and you'll be fine.
More throttle respone
Once the truck ran for a while and went through the whole 'learning mileage,' it seems to have more response when you get into the throttle. The engine noise also got a little louder due to replace the factory tube and it made it sound more like a V8 inside the cab and not a Prius when you get into the throttle.