I have the genuine Canyon with setback (setback obviously will have more spring) and it is great, lots of vertical flex. But if you have back pains it'll probably be more worth looking into the bike fit thread.
If you have lower back pains for me a Brooks saddle helped because I found my butt bones are asymmetric, as the saddle broke in a big dimple on the left side was formed and my longer ride pains have mostly disappeared.
I have the genuine Canyon with setback (setback obviously will have more spring) and it is great, lots of vertical flex. But if you have back pains it'll probably be more worth looking into the bike fit thread.
If you have lower back pains for me a Brooks saddle helped because I found my butt bones are asymmetric, as the saddle broke in a big dimple on the left side was formed and my longer ride pains have mostly disappeared.