I still have that beat, because you still need all the other parts and have to assemble it all yourself. :D
Replacement parts are just as easy to get 7 days a week for my kits also.
(Just so you know, we had ONE system fail in two years so far, and I sent that person a new module free of any charges via Priority Mail)
We also have email and telephone support for installation if needed.
There are two real differences between my HEI kits and the designed to drive setup.
(I use the newer weather proof HEI modules and connections that come pre assembled, and they don't mount on the distributor.)
Add up the designed to drive bracket and all the other parts for the HEI change and compare it my price for the same thing with newer electronics and not having to wire it all up yourself.
Also, try to get support of any kind from "designed to drive" if there is a problem with the HEI parts or hookups. (they sell and support the bracket, that's all)