Tado X vs v3 in the UK: price and features.

I am about to get my boiler replaced. My Plumber wants to install a Vailant which uses eBus.

I wanted an actual upgrade to my heating system so was thinking of getting Tado installed whilst I was at it.

In the UK Tado is only officially selling the v3 products. So I went on the European site and noticed that not only is Tado X much more expensive it also doesn't appear to support eBus.

What does Tado X actually offer over and above Tado v3? The only thing I can think of is longer support into the future for their products (ie getting new rad valves and app support). Seems like if I invest right now in v3 I get a comparable bargain and my boiler is supported natively with eBus.