If you haven't already done so, see if your retailer will give you a car over night or better yet rent one for the weekend.
I was very much in the same boat as you in that I was wanting to move to a CX but felt unsure. While I am in a Trad and not an Aero, the musings you have stated were much the same.
I've not fully decided on if a CX will one day grace my garage but the draw to one has diminished slightly. My car had massive suspension issues and was feeling a bit 'old' for being 6 years old. I then finally got back to my main retailer and had all that sorted so the love is back.
However, the idea of more cabin room, spec'ing a car again etc still lingers.
I echo all that has been said about the CX within this and other threads. It's a fantastic car yet has it's flaw. One very odd one that sticks out was the constant running of the radiator fans which came on in full force within mins of driving. It's all I could hear which took away from the experience. The other was the duality of its character. The car is so much better composed than my car and begged to be pushed but doing so felt strange. And with so much power I felt I was constantly wanting to push it. Yet the other part of me wanted to settle down and drive it as I do my Trad. I appreciate this probably isn't translating well but in short, I walked away scratching my head lol.
Back to the long test drive. If I were to order one, I would pony up for a weekend rental to give me time to fully live with it. I backed away from contemplating a build based on a short drive which turned me off the car but something in the back of my head lingers and questions if I perhaps shouldn't judge it after a short experience.
Lastly, if you are going down the pre-owned route, do brush up on all the minor upgrades in regards to the top, seals etc. I recall Williams had two Plus Fours that were built within months of each other and another when the Plus Four just launched. The difference in door and top seals between all three were significant. The oldest having random cuts of rubber, the middle with a set-up looking a tad more polished and the third having moulded bespoke seals. I'll try and dig out the pics I took if they are of interest.
Good luck
P
