I love it. I paid $550 for my 5.3 with all accessories, wiring harness, exhaust manifolds, and ecu. Still working on mine , but I have taken it for a few spins on the road. I work away all week and only get to work on it on the weekends. It was well worth the time spent doing it in my opinion. I can install any LS series engine in now, all the hard work is done. I'll try to answer any questions you might have.
Correction on who did the wiring harness, it was Wait4me Tuning. I got my fuse/ relay box from EZ Wire. They were top notch, I would use them again.