Is it fully tested yet, that page says their new tower "will" (not does) provide testing? It's not the sort of thing I'd want to be an early adopter on.
Tom Scott did a video[1] on it last summer. They have a working version in a test tower in Germany, but have not installed it in an actual for-public-use building yet and I'm unsure if testing phases have been completed
[1]: https://www.youtube.com/watch?v=kdTsbFS4xmI