My experience is limited to the ones I built, but they are a VERY close copy of the North Bars. They run deeper than most bottles, they are more of a swimmer than a darter, they weigh less than big bottles which limits distance some. I liked them in slow moving water, though they probably would do well in very rough conditions because you can can get them quite deep. What they excel at is covering depth. You can drive them down, then slow them a bit and they'll gradually work their way back to the top. Fish seem to like that. They are a smaller profile than the big bottles (if you are a match the hatch believer).
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