I have the MSD 6al. I love it. It is realiable as hell and has the rev limit feature. My freind uses the same box along with the MSD distributor on his 430HP 347 stroker. Works great, never misses a beat, easy to install, looks great, easy to mess with the curve springs.
I don't have much experiance with other units, so this eval is not a comparison. Just my 2 cents.... Hope this helps you.
Steven
