My advice is buy it you won't regret it!!
I guess I bought mine about January. I thought about it A LONG TIME before I bought it. I wish I had bought it sooner! (Redline Smoke Pro)
I bought mine from the Matco truck. He made me a "smokin" deal. At the time they were offering a package deal with a code reader that I had no use for so he knocked a little off the price. I paid $1000.
I have used it for all kinds of things you can really get creative with it. I joke that I even use it to find bad ball joints (doubt that's possible). It really does work for oil leaks, some cooling system leaks, plugged EGR passages, I have even verified EGR valves are sealing correctly. It really is necessary for most EVAP concerns.
It really turned seeing EVAP codes on the the scan tool from "****!" to "$$$$".