I owned a 1988 model GM4T, it had the strat body style (hard rock maple) and a H-S-S pup configuration. The sound, IMHO, was due to the active EMG humbucker in the bridge (Emg85?) and that stiff epoxy neck. I used the guitar mostly for rock and it had a very sharp attack that right through the mix when using distortion.
If I had to describe the sound (clean, no distortion) I'd say it was very tight, focused, very little coloration.
I ended up selling the guitar 13 years later but it still played as good as it did when it was new. The trans trem is the most stable and smooth tremelo system I've ever played.
Ned Steinberger is a genius.