Did a magnuson tvs1900 on my 5.3, it's a freaking animal now on 13#'s of boost. Pushing a little over 500 rwhp, they can be super fun if built properly...
Did it myself with help from a friend. It was easy, yes, it is very reliable. It is my work truck that I drive everyday and pull boats up to 8k with it regularly in town. Highway it pulls down 18.7 mpg at 65, in town beating the piss out of it it gets 11.6. I only did kooks headers, y pipe, custom exhaust and injectors, everything else is stock. Still rocking the stock air box...:rofl:
Of course I'm running a smaller pulley to make that much boost, I have a ZEP griptec, they are badass...