I used to use the Arts Acoustic reverb alot.
I wished that E-mu still maintained Emulator X, not that I've ever had much time with it as it is either crashing or crashed.
The PPG is a sad one, I have 3 of the PPG synths, I'm sure Wolfgang sold on the brand to PA thinking they would do something with it but it seems that's not going to happen. Bit pointless for them to take it on, it wasn't a competitor in anyway and it seems to have been dropped from day one.