Homebrew PCBs

I was just browsing the pre sensitized boards at Circuit Specialists 
(http://www.web-tronics.com/printed-circuit-board-supplies.html) and 
noticed their non MG double sided boards are priced much lower than 
the MG 600 boards. 

Is there a compelling reason to opt for the MG boards over the non-
MG boards? Also is there functional difference in the MG positive 
develoer and the unbranded positive developer they sell?

Thanks for any comments.

Art