I hope Grip-Shift is buried forever...
Haters gonna hate.
I HATED grip-shift, horrible. Could never get it adjusted so all the gears rode properly through the deraileur.
You weren't doing it right. I used SRT-800s for DH + DS for years (one season on Precision Billet's machined Pro Shift system when I was mad at Sram), and in thousands of runs I never had a mis-shift that couldn't be attributed to operator error. It had to be CLEAN, you had to use Jonnisnot on it, and you had to use good cables. With it set up and working right, there is no trigger system made that can run through the block with the speed of a twist shift. When the clock's ticking, that can be a huge factor. Going for a ride in the woods I'm happy with either of the three systems. Of my 11 MTBs, 2 have Grip Shift (ironically, they're FS bikes, in contravention of MBA's ghost shifting dogma), 2 have Shimano triggers, and 7 have Shimano thumb shifters.