I have a CX4 Quick but the 2019 version and I am a big guy, I like it a lot but I have had a few issues with the bike and to be fair the LBS who sold it.
There was a problem where the gears would keep jumping when I was riding but were always fine on the rack at the lbs, turns out after many visits they finally contacted cannondale and there was an issue with the cable routing thing where the cables came out at the bottom of the frame when under load, it was easy to fix and had been fine since.
I also had and issue with spokes breaking and coming loose on the front wheel on a bike that did very little miles at the time, it took a lot of visits to the LBS to try and get this rectified and it wasn't until the spoke they put in broke they were finally willing to contact Cannondale. Cannondale supplied them with better quality spokes and they rebuilt the wheel and it is fine now.
The cable issue may be sorted in the new model and I may have just had a duff wheel and they have be great since.
I actually put some slightly smoother tyres on mine as the ones supplied were gravel tyres but the supplied ones were fine, you won't need bigger tyres I wouldn't have though.
Here' the link
https://www.evanscycles.com/cannondale-quick-cx-4-2020-hybrid-bike-EV360883
I can go into
Evans here in Brighton, but if someone can recommend an indie selling Cannondale in BTN, I can try that too.
Cheers!
That link goes to the CX4 but the description is the CX3 so the specs are slightly lower, for example the brakes are hydraulic not mechanical, or at least they are on the 2019 version that I have.