Adam, believe it or not, I did a side by side compairison of the SENKO and ZNAIL in my swimming pool. And the Senko had way more ' tail quivering ' action on the fall.
I still use a ZNail mostly at the pond.( BPS had ZNAILS in junebug color for something like $ 1.38, so I got about 12 bags of them lol .. They was on clerance from $ 3.99) I had heard ZOOM was gonna quit making them. ( not sure if that is correct or not )
Now, I do throw a ' blueberry colored ' Znail in some of my tournies. Even though I know without a doubt in my mind that a SENKO has way better action, I still produce fish with the Znail.
Ok, I know I got off the topic here but wanted to throw in my 2 cents on the Znail.