It doesn't really offer me anything, we've had a Sunset Overdrive Xbox One since they launched but there hasn't been a game played on it since just after Forza Horizon 3 launched. It's all packed up now and I will get around to selling it or giving it to someone at some point.
Because Microsoft got so much wrong this generation, all games but a couple of Xbox exclusives have been bought and downloaded from the PlayStation store and there is genuinely no value in considering changing that this generation. We're just too far into the generation to even entertain the idea now.
Also, that £449.99 would buy a hell of a lot of PS4 games that I'm really wanting to play.
EDIT:
Xbox is essentially a Forza Horizon box in my house now but I think even that has gone now due to the way they handle DLC in the game. The cost of buying Forza Horizon 3 with all content has really killed my love of the series, due to that I won't even look at Forza Horizon 4 when it's announced. That series would have been the only thing that would have encouraged me to consider handing money over for their next console.