IIRC the orignal gripshift were a typical usa product, nice and light, worked OK in dry conditions but knackered if shown a bit of mud, only after they bought sachs with their wavey shifter and direct cable (dirt?) mechs that they were a reasonable proposition. I used sachs waveys they were good, proper cheap, light, big flange you could grip if your mech got gunked up, just worked. Had some gripshift in early 00s was using a road cassette on an mtb (shift-tastic) so moving across the entire block in one go was good. The 2 finger brake levers I was using at the time meant I was using super short grips and riding with my hands on the shifters so wheelies/bunnyhops ended up with the odd shift. Use longer brake levers and you may be ok with longer grips and not riding on the shifters, dunno.
Friction front shifting is cool.
triggers are just better for pretty much everything else tho.