It's low price v. potential hassle. Really comes up to what you can tolerate. I have a work truck so, I don't really need to DD the Mustang so, having it down a few days isn't a big deal, really. I was very pleasantly surprised. I got every bolt, nut, washer, clamp, pre-modified hoses, everything, even the supercharger oil. The only hassle was the tuner wasn't properly unmarried and the PO is working with me on the cost of dealing with that.
This is my second Ebay blower purchase and I've been very satisfied with both outcomes and the willingness of the PO to stand behind what they were selling. Not saying everyone will have that experience but, this is a kit that, even on super special, non-polished, is a minimum of 4500 new, with no tune or tuner. If it's a true "full" kit, it's 6K, new, easy + the IDs and a custom tune to replace the Vortech one. This one actually sounds like the "Beefcake Special" ID and tuner kit package, likely.
2014 Premium GT, SGM, Brembo, Auto, Tech, Comfort, etc. GT500s, Steeda UCA, VMP auto tune, 100 shot on BBR tune, best et: 11.38 at 120.85
2012 GT, Candy Red, Brembo, 3.73, Tech, Comfort, etc. Procal tune, Roush upper, UMI LCAs, Steeda red bracket, GT500s, 28X10X16 Hoosier slicks, best et: 11.91 at 115.23 RIP