I actually played with 3 PQ Tables:
- a G2 (which is no more on the market)
- a G3 Basic (only 6 fingers tracking)
- a G3 (up to 32 fingers)
I implemented softwares using TUIO/AS3 and a bridge udp/flashlc.
The first one died we don’t know how nor why…
The second one works very well (but was installed few days ago).
The third one already had a problem (installation was done a month ago).
The first point to say about this hardware is that it actually depends on the luminosity… The 32 fingers tracker is more concerned by this problem than the 6 one. But when I say “luminosity”, I mean sun: you may run your app on the table with some light, but if it’s too sunny, then the hardware starts to be useless… (I was looking for some information on this topic when I saw your thread).
With this in mind, I can answer your questions:
1- Yes, I have no problem when I touch the screen… But as all trackers, there is a limit when 2 touches are too near from each other. (I noticed that the 6 fingers tracker worked better than the 32 one concerning this distance!!)
2- I don’t know what is “ghost fingers”.... A quick search on the net gave ma some examples, but I don’t know how you can handle this concept with the PQ Table!
3- Done! I suppose that IR sensors are sun sensitive (and may be heat?!)
4- As I said, the first table (G2) died… But this may be because of our windows, the sun, the heat, etc… An other problem is the leak of information on their website… But their support is quite good!
To conclude with my feelings: I think that this hardware is good “indoor” solution, and works pretty well.
I hope that this helps you.