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I kept tilting my seat when I hit bumps when riding with the single bolt setup on the last seatpost. This thing has been rock solid through some cross country & short track days. No more tilting issue and shaved a few grams in the process.
I bought this for my road tandem, replacing a Thomson X2. The old stem had developed a creak coming from the faceplate bolts, and I needed to adjust my position slightly anyway, so I replaced the 120mm -17ï¿½ stem with a 110mm -10ï¿½ X4.
The new setup is significantly stiffer. I can't be sure whether the difference comes from the slightly shorter stem or the 4-bolt faceplate or both (although I suspect it is mostly the 4-bolt design). The handlebars feel significantly more solid when out of the saddle. Both the steerer clamp and the handlebar clamp on this stem are slightly taller/wider than on the X2. I had to remove one spacer on my steerer and slightly move my Garmin mount to accommodate the difference.
Purchased this to replace the stock carbon seatpost on my Canyon Ultimate. The seatpost came in 19g lighter than the listed weight (160g on my scale vs 179g on Thomson's website) and fit into my seat tube as expected. The zero setback is still comfortable and there hasn't been any slipping or loosening of the saddle rail bolts in the first 300km.
The biggest complaint is that there's no markers for seatpost height, which would have made adjustments a little easier, but that's mostly a quality of life gripe.