I haven't fished them, but they do hold some promise. A concern is the shank is pretty short and a siwash will put the point farther back from the lure.

With a siwash, at the same time as you are pinching the barb use your pliers to offset the point about 10 degrees and then bend the point down slightly. I've been doing that on my hootchie set-ups for the past couple of years and feel that it helps with retention as the hook rotates going in and needs to back out the same way.