MSD 6al vs Crane Hi-6 or the like?

I know that MSD has the high and mighty name in ignition, especially their 6al spark control box, but how about these other companies like the Crane Hi-6, and i know holley makes one, and jacobs, etc. How do they stack up against the msd's?

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Chris Dagenais
CST Kelsey
'71 Malibu soon to be 454!
http://member.xoom.com/Gandalf80/Chris'sPage