More importantly is it as good as they say ?
It's a good bike and I really enjoy riding it. A very smooth bike, much more akin to my carbon bike than the other aluminium roadie.
In terms of the upgrade list...
I changed the saddle from a Fizik Arione R7, to an Arione R1, lighter and more comfortable.
I have also worn through the stock chain and replaced with a KMC, which is much nicer. I was surprised that it was worn through in 1,000 miles, but they weren't dry miles and it has only had winter use. Park Tools recommend changing the 11s at 0.5% wear and the chain was beyond this. The new KMC isn't reading any wear at all and was a much better when fitted. I hope to get better life out of this than the shimano offering.
I would also like to change the the wheels to something a little lighter. They current wheels come in at over 1,800grms, so I would like something lighter, but am struggling to justify dropping over £500 on the winter bike for something that isn't absolutely necessary.
No regrets at all, completely fits the bill of what I was after, a light winter bike with discs, that was better and lighter than my commuter, but not as good as the summer bike. I don't mind getting the bike dirty, but usually make sure it gets a good clean. It will be used for damp rides in the summer too and also for the likes of the Dunwich Dynamo, when I don't want to unleash the pot holes of a dark ride on my carbon wheels.