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@veLLo
Hi, I have both systems.
From reading the instructions back when I bought these, I think they recommend using either adaptor only on a steel stem or steel steerer. Seems quite risk averse on their part but in my case I was able to comply.
The ahead stem adaptor works perfectly fine, so can positively feedback like @FarCorfe
Can take pictures if you want. The plate that goes over the steerer isn't very thick so unless you've not much insertion height already in your stem, you don't really need to remove any spacers (you're only raising bars by 1-2mm max)
I found the seat impossible to use with drop handle bars (I feel silly I even tried), only works (for me) with city bike-like bars.