Calling all Cervelo S2 owners

After my previous question about frames etc still v interested in Cervelo S2. With this being more aero I'm concerned comfort maybe compromised.
I know it's not a sportive geometry or set up but want to know I could stand up after doing a century. Unable to try this on the road but a spin on the turbo seemed a nice place to be but I'm sure owners are best to give me a better idea.
So opinions on what these are like to live with as your main summer/Sunday bike. Please be brutally honest.