Actually, the misconception that the double-stack mags don't feed as well as the single-stack mags is due to the cheap aftermarket mags that used to be found with many of the hi-cap Russian Maks. The unreliable feeding problem is solved by using factory Russian mags (distinguished by their gray zinc-phosphate coating, as opposed to the gloss black sheet metal of the aftermarket mags). These used to be difficult to find, but not any longer.
As for the price, it's not bad. It seems the price on most Maks is going up --- the $100 Bulgarian milsurp Maks are virtually nowhere to be found.
And as for Bulgarian Maks being produced in Russia, most evidence points to Bulgaria receiving the manufacturing machinery from East Germany -- EG production was prevalent in the 1960s, while Bulgarian milsurp production took place in the 70s.
Take care. Marko