Hmm, in a word, yes! I am a "believer" now as well (different Rob, by the way). Out here in Kansas and Missouri, they are great for just pitching weightless in brush and trees and just let fall. The oscillating fall of these plastics seem to be magnets. I have constantly been amazed.
By the way, there is also a lure called the Kinami Flash (available at BPS) which is made by Derek Yamamoto (Gary's son) which is the exact same as the Senko. Primary difference is they are sold in bags of 7 for $3.99 vs. the bags of 10 for the regular Senkos at $5.99. Price breaks down the same, but for those of us who go into sticker shock when paying over $.60 per soft plastic, the smaller bags make it a little easier.