After opinions on either of these two. Price is the obvious difference.

http://www.piersideparts.net/mm5/merchant.mvc?Screen=PROD&Product_Code=MS...

http://www.piersideparts.net/mm5/merchant.mvc?Screen=PROD&Product_Code=CB...

I know Summit have the MSD $50 cheaper than Pierside.

I have certainly had no issues at all with teh MSD dissy in my ute.
4 years and nearly 80,000km.
The springs and bushes make it very simple and easy to tailor your advance curve to your needs/engine.