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I've contemplated the ratio kit in the past a few times. The earlier ratchets looked a bit rough on the edges (cast, forged 3D printed?) which I assume could be a downside for component more fine than the OEM. Newer ones look pretty smooth though.
If I were still interested in mechanical sram 12s on road/gravel, I'd probably just get the new Apex. Yes it costs, but I believe they addressed the issue with Master cylinders failing prematurely on the older, Hydro/Double-tap shifters.
Still think this is a great bit of kit though.
The only negative I've come across noted that the adjustment more frequently went out and needed fiddling, and the cable and housing needed to be more carefully selected and installed. Presumably because of the smaller amount of cable being pulled, misadjustements were magnified.
All that said, I'm still interested in trying it to get greater range. On an 11sp 40x11-42 I get nearly enough range for most of my riding, but I'd like a bit more top end and low end. Something like 42x11-50 12 sp could get accomplish that while still giving reasonable steps for more comfortable riding in a group.