The +R Silver topped ones in cake box MIT have been Infome R20 for me and burn well on my Benq. Typical quality scan scores of 97. Play well on my DVD player...
The +R CompUSA branded discs, made in Hong Kong, on the other hand were about as awful as one can get.
The -R White tops have been Princo - not worth the gas to buy and return them.
These last 2 should be banned as a waste of natural resources.