Short update from my side. Today I could do the first longer ride (68km), all in all I have done 145km on the bike so far and I would like to summarize my first impressions. The bike is agile and responsive and accellerates very well. It is definitively stiffer than my other bikes (I sense that in my bum area after the ride today…) with the seat post being the most flexible part. This was expected, I guess this is a feature of a bike with such a short seat tube. And my seatpost sticks out particularly far from the seat tube since I I have a small frame given my body height.
By the way, I had redone the complete installation of bottom bracket, cranks and pedals by the book (I love Sram‘s video instructions). I turned out that I had forgotten the washers for the pedals. The creaking is gone now. But, the seat post started moving again. I removed the tape and got myself an (insanely priced) original SL8 seatpost clamp, which is a liitle bit wider in diameter and when tightened really tight. The Spcycle clamp was always a bit loose also when fully tightened.
To sum it up: I like the bike very much an am looking forward to the next rides.
Edit: Garmins‘s original Varia mount for seatposte like this does not work well on this bike. I need definitively another one.