It's one of those "Get what you pay for" things
I've used multiple DDM kits (my previous order will be my last though)
The kits themselves are hit and miss it seems through different forums. And their customer service is next to NONE.
The guys at TheRetrofitSource, while are expenssive, have been nothing but great through multiple orders
Kits are great, and IF you have a problem, they are always there to replace it