A while back I bought some knock-offs called Benkos from the Big Bag Bait company and they were alright but they weren't as soft as Senkos nor as heavy. They still wiggled on the fall but not as much as Senkos and a few of them had minor kinks and other deformities due to poor quality control. They were salt filled and scented, but not as much as a Senko. They still caught fish but if you threw a Senko and a Benko side by side, I'd bet money that a bass would eat the Senko first.
Tight lines,
Wade