I have both, I like the helix's the best, I absolutely hate the herpstat II, waiting for the thing just to make a simple adjustment annoys me. Between the helix and and the regular herpstat I'd put them at the same, I just like how helixs are easy to mount, where herpstats are kinda goofy shaped.
If either one of them would give me 3 buttons (up/down and biggest factor of all, the enter button) so i don't have to wait for it to cycle, i would easily convert over.
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