Last bit of the sentence - how do they compare comfort wise? Seems to me that it's two different solutions to the problem of improving on-bike comfort. I'd like to know if anyone has experience of both and can give a judgement of the effectiveness of each solution. The motivation is that a Donane is significantly more expensive than the canyon endurace is going for at the moment. If the VCLS system works as well as Trek's then that may be a more likely option for me.
And to give it a bit more context, current bike is a defy composite that is good, comfort wise, fitted it with a shockstop stem which has certainly helped me to be able to ride further more comfortably but I'm tempted to change it up for either an endurace or a domane in order to have a comfortable rear end as well as the front end. Very much being pulled in three directions at the moment. Defy is already lovely and heavily upgraded but am sorely tempted by something new.