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Funnily enough I have one on the gravel bike. It's great and good at cutting out road/gravel buzz although isn't much help for anything more rowdy such as tree roots.
That and a Redshift stem have both been great additions for comfort on the gravel bike without adding a huge amount of weight or complexity.
You can feel it bob a bit when putting in an effort like a sprint but TBH the Redshift stem is much worse for that than the seatpost.
Yes! I had a frame made by them. As the reviews say, be extremely specific about absolutely everything you can think of.
I gave all lengths and angles, the amount of seat tube I wanted extended above the top tube, the location and type of every boss and hole, and the tube diameters for every tube.
I specified super specifically that I wanted oval tapered chain stays as they default to skinny round ones which functionally are fine but I hated the look. They tried to persuade me out of it but I stuck to my guns.
Also tell them standards like which headset and BB you want to use, what size rotor, what size chainring, crank length, tyre clearance etc
I think in the end it came to around 1k shipped to my door but I avoided import duties. Had it 2 years now and it's sweet. Went for brushed finish as it's easy to touch up by hand but blasted looks good too if you want that moots look