I have managed to test this bike and to me its rear flexing triangle is an engineering wonder! On a daily basis I ride a steel Jamis Renegade Exploit bike with a Ergon CF3 (aka Canyon VCLS 2.0) flexing seatpost and I thought that you can't get any more comfort than that but a stock GT Grade with a standard (but carbon) seatpost and a Fabric Scoop saddle turned out to be in some cases more comfortable! I also experimented with Flipchip fork and found out that it really changes the bike characteristics but in the same time you quickly adapt to this change so in the end I found this more of a gimmick than a really useful addition to this bike.
In general this is a very fast and effective bike but in the same time I can't shake the feeling that the ride was somehow muted compared to my steel bike.
If you want to by this bike just remember that it has a fairly long geometry (I did not liked it that much but this is a trend in todays gravel bikes so it looks that we have to deal it anyway).
Got questions? I will happily answer them and you can always read my review to get more informations:
I am happy to hear any feedback from you.