bewCloud creator here.

Hundreds of people are using it as a replacement. If you don't use/need more than the core Nextcloud apps (calendar, contacts, file/photo storage and sync, notes), it's a great replacement for it. If you want/need/use Nextcloud's extensibility (the multitude of apps), it's not really an option right now (maybe in the future I'll add some sort of external app system, but it's not in my near-term plan).