The Thomson X4 is stronger and 30 grams lighter than the Thomson Elite 25.4 mountain stem, and features a traditional steerer clamp that is shaped to save weight and be knee friendly. The X4 is absolutely the best combination of strength and weight available.
I got a 50mm stem for my Yeti SB66 and, as always, Thomson has designed yet another masterpiece of aluminum perfection. Some products & components are high priced because they're trendy, but not Thomson. The good folks at Thomson put some serious thought into the design of their components. This stem is freakishly light and once you put it on, you'll never think about it again. I've pinned my front wheel into deep rocks that had me yanking hard on the bars in a way that would have other bars getting out of alignment but not my Thomson. I've also had several garage sale style crashes and although other things have had to be realigned afterward, my Thomson stem does its job of keeping the steering crisp, straight and on track each & every ride. If you're like me, I was once hesitant to invest in such a high priced component for fear that it was just expensive because that's just the way it was. But trust me, this is an investment that is worth every penny. If you haven't experienced the joy of breaking a stem mid-ride let me tell you this: it's not a fun way to hit the dirt & rocks. I've broken several stems in my day, but never a Thomson. I've been running Thomson's components for about 15 years and I've loved/trusted each & every one of them.
It is expensive, and there are lighter stems but man this thing is “well-made personified”. If you want a stem that is crazy built, very reasonably light and looks great this is the one to get.
Made in Macon, GA, these are very high quality stems. Yes they are more costly but they will look great after years of use.
Built up my new Ellsworth Evolution from PP with Thomson post stem and bars. The stuff just works...so far, Thomson products have never failed me on a bike...ever. I have been lured to some other products before to save a few grams, or because they looked a little better, but I am happily back on Thomson. The stem bar clamp area seems much more solid then the Easton I was considering buying again (EA70), and seems stiffer.
This is my third Thomson Elite X4 stem. I will keep using these until someone makes one lighter, stiffer, and better looking. Thomson quality is the best. Thomson seat posts are great too.
I only use Thomson stems on my bikes. I have a 50mm on my Pivot Firebird, a 70mm on my Pivot Mach 5.7 and a 90mm on my Vetana El Ciclon and all of them are just awesome. The quality is unbeatable, clamp firmly and evenly and they look great.