I bought this seat because I compared it directly to the Yepp Mini, and realized that I would have to buy an adapter bracket for that one, making it the same cost but heavier. seeing that the Yepp Nexxt Mini included a "universal" bracket that fits "both normal and ahead stems," I figured it made the most sense to buy this one. Upon arrival, I realized that the manual made no mention of a different install process for ahead stems, which is on nearly every bike sold in the United States in the past 20 years at least, with the exception of a handful of cruiser type bikes that still use a threaded quill stem. The manual states that the max steerer diameter is 28mm, which again, nearly every serious bike sold in the past 20 years uses a steerer that is larger than that.
After trying a few things that didn't work very well, I contacted support. The person who answered was obviously unfamiliar with the product, as they recommended I buy the ahead adapter bracket for the older seat (which does not fit this seat), and just told me that it must not work on ahead stems then, completely contradicting the Thule's own description of the item. The manual is worthless. I guess it's geared towards making it not language specific because it's nothing but a series of pictures, but at least give people an option to download more detailed manuals.
I eventually installed it in a way that I found to work. The seat appears comfortable for my daughter, is VERY light, and mounts high enough that I feel like it intrudes on my knees as I pedal less than other seats I have tried. It does make it very difficult if not impossible to stand over the top tube when you stop, though.
Another thing to think about is that when I pedal uphill, apparently I steer side to side slightly as I shift my weight. I never noticed this before I saw my poor girl swaying back and forth. Just seemed like it wore her out for more strenuous rides due to the way it mounts to the steerer.