I only have one rack, and to be honest I have no idea why I chose the Herpstat over the Helix, but I really like my Herpstat. I bought it directly from SpyderRobotics http://www.spyderrobotics.com/products/herpstat.html I went the ND though because you don't need the additional cable for the night drop. I think the only thing I've heard against the Helix is that they only have one button.
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