Can't speak for our LS1/2's, but I've been using MSD on my Saab for years and love it. I've killed the speed limiter on the stock ECU and use the MSD to not spark one cyl at redline randomly every revolution, thus a more gentle hit on the engine if I over rev it. Works great. Also, multiple very hot spark with the MSD Blaster Coil (still uses a distributor -- it's a 13 yr old car...).
BTW, it's an MSD 6AL with the MSD Blaster and Magnacor plug wires. Works great. I can only assume the MSD Coilpacks should be of similar great quality.
Jim Miller
'06 M6 18" Phantom on black
'02 Saab 9-5 Aero
'93 Saab 900 Turbo Commemorative #116, Heavily Modified -- MSD among others....
'91 Saab 900 Turbo Special Edition Convertible