G3 & G4 keyboards feel pretty good to me with a softer force curve that drops all of a sudden when actuated.
Definitely not a bad membrane keyboard imho; if I was forced to use one, I would preferbly use either of these.
Also, the uni-"foot" that swings from the front of the keyboard to the back to prop it up is a pretty neat and distinctive design for the time and still is.
The G5 keyboard on the other hand was absolutely horrendous and a pain to clean when stuff works its way below to the clear bottom casing to contrast conveniently with the white inner casing.