Nice bike!
I've also just joined the CAADX club by treating myself to a CAADX 105 Disc from
EBay.
The seller had only ridden it once, decided it made his bottom hurt and didn't touch it again! It was the 2016 model (only a month old) and still had the manufacturer's wax on the chain and sprockets and little knobbly bits on running down the centre of the tyres.
I was the only bidder and got it for the starting price of £650. Well chuffed!
I've changed the tyres to 35C Marathon Plus and fitted some SKS Chromoplastic mudguards, as I'm going to use it for a winter commuter.
Where did your LBS mount your left-rear mudguard stay as I can't see from the picture? I ended up manufacturing a small right-angle bracket and attached to rear calliper mount.
I've also bought a rack the same as yours but haven't fitted it yet.
Took it out for a shakedown 32 miler yesterday and absolutely loved it. These CAADX frames are amazing for smoothing out the bumpy bits and the 35C tyres probably help a lot as well. I reckon these bikes are probably the perfect winter commuting machine.
Not impressed with the factory wheels so don't blame you for changing them. I gave all the spokes a pluck and don't think I found 2 of equal tension. On the first hill of yesterday's ride, as soon as I got out of the saddle I could hear the unmistakable sound of unwinding spoke twist. I'm going to get them into my Truing Stand after a couple of hundred miles for a good stressing and re-tension session. I also felt they made the bike look like an advertising hoarding so have removed the monstrous decals with the help of a hair drier and the bike looks much better for it.
As far as gearing goes, I found myself in my Granny-Gear far more often than usual as my road bike (Merida Ride) goes up to 32 teeth on the rear cassette. I must admit, I like having a couple of cogs to spare on the steep stuff but suppose I'll just have to 'Man up'.
The disc brakes don't stop me as well as I would have expected them to, but assume they will improve somewhat as the pads bed in. At least they should stop me the same wet or dry.
Anyway, best of luck with your new bike - I'm sure we'll enjoy them both immensely.
Graham.