The Impala SS guys have been running the Mezeire for awhile and they seem to work pretty good. There have been a few failures, however, so some guys carry the extra motor for roadside swaps. I think there is a guy that makes a custom wiring harness with a built in warning light if the unit fails.
They work great for quick cool downs at the dragstrip, but often have trouble keeping up on a road course. A friend went back to stock on his Camaro because the constant high RPM's on the track were too much for the Mezeire.
There is a boatload of great LT1 info on the
Impala SS Forum. 
Good luck,
Randy