The weather has been pretty bad lately, so I haven't had a chance to give it a proper ride yet.
Perceived stiffness really depends on rider weight, power output, road conditions, and distance.
That said, a lack of stiffness is rarely an issue with modern carbon road bikes.
Also, this frame has clearance for up to 35c tires, so comfort definitely shouldn't be a concern.
I bought it from the first store. There are also two other stores that sell it.
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https://tinyurl.com/4fjcmh8b2.
https://tinyurl.com/2p9r64db3.
https://tinyurl.com/5yu47rkm