From my testing the PNW one is slightly better put together than the Woolftooth, and cheaper too, but not much in it. Also really like the rubber pad on the lever. I though the quality of the grub screws etc was better as those on my WT burred pretty easily.
Key to both of them, and the One Up, is the use of a big bearing for the lever to pivot on, which makes them much smoother in movement, but also have very little play.
The main issue with both PNW and WT is that because they sit close to the bar, they limit the range of positioning if used with the E6000, because they can rub the cable from the e6000 to the display, as the cable exits at the bottom of the E6000, and my concern was damaging the cable.
This means you have to jiggle around the various bits and bobs to get no rubbing, what inevitably means something might not end up in quite the position you want it to. Depending on where you like your contols this may not be an issue, but something to be aware of. You can see it in this pic with the WT.The main issue is you have to rotate the e6000 to always be in line with the dropper lever or vice versa.
I found the One Up mounted using a Sram MMX to my brakes gave the best operation, and also ability to get everything where i wanted as it sits a bit lower off the bars so doesn't foul anything. I run my levers pretty far inboard which also doesn't help getting everything where i like it, and using an MMX or an I-Spec adapter really helps. I think mounting the WT or PNW this way would also help, but PNW don't make an adapter yet, and when i got the WT i could only find the conventionally clamped one in stock.
You can see the cable in the attached pic with WT Remote. You will see I'm my earlier post that when i fitted the PNW and One Up i moved the controller further along the bar to prevent accidental pushes of it when reaching for the dropper remote. One of the best things about the One Up lever is it replicates the positioning fo a shift lever, and actually sits further under the bars, whereas most levers end up sitting in line with the e6000 controllers buttons making it easier to accidentally change the mode when reaching for the dropper lever. One Up's positioning makes this very hard to accidentally do.
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