I personally haven't used the PTII yet. I did just order one this morning though. I think it's just like any other tank out there. High end devices included. You'll see good experiences, you'll see bad experiences. With a device like this particular one, I think it's important to note that if you aren't willing to experiment, then you can't form an accurate opinion about the tank. There are so many variables to account for in this hobby, it makes it extremely difficult to replicate and one persons experience. This is the reason there is so much subjectivity within this hobby. I personally have found I compare this whole thing to cars. Let's say we both have an identical 68 nova. Now lets say I run high test, but you run mid grade. Is the performance going to be the same? Most likely not. Now lets say the same identical cars run the same fuel, but I use a demon ignition system and you use accell. Again the performance will be similar, but not spot on. Not sure where I read it in this barrage of posts, but if you're not happy with the performance of a device, move on to a different one. There are way to many options available in today's market to dwell on one item not working for you.
On a side note, bashing people for their opinions might not be the best way to gain knowledge from experienced people. Tell your mechanic he is wrong only so many times until you're told to find another mechanic. Welcome to the boards though.