I got a Launch Book recently, (one of their mid-priced scan tools). So far, I tried one job with it, to scan a CEL on my son's 95 z28 and it failed miserably. Could not communicate with the car at all, even though the software showed the car and engine. Spoke to their tech support, and they had no clue whether it should work or not. Now this car is a bit tricky, as it's OBDI with an OBDII connector, but I never had a problem reading it with Modus, Solus or Verdict.
Also, all the software and manuals are written in a quasi English...like the whole thing was translated from Chinese using Bablefish.
Friend of mine has a higher end model (x431), and he claims it's pretty good; and better at certain jobs than his Verdict. I don't get the idea of a very big unit with such a tiny screen. The PDA based units don't seem too convenient either. Seems to me a bigger touchscreen would be idea...who will be the first iPad scan tool????