The handles and carts are made by Dorco. The handle effectively comes free with the first order. The twin blade carts are not Trac II compatible, but should be Atra compatible. The only way for DSC to lower quality is to source from a Chinese company rather than a South Korean company manufacturing in China and Vietnam...
Gillette, Edgewell and others produce very good products in China. However, it's a different matter when it's Flying Eagle ...
I agree with proper oversight and QC Chinese goods can be very well made as well as quite inexpensive!