Sure, everyone is welcome to download OH3 from Download openHAB | openHAB and play with it - there’s still a great deal of work to do so it’s taking its time, but it’s actually quite useable now (I’ve been using it as my primary instance for a few weeks) and I’m hoping most will view the new UI as an improvement 
Constructive feedback is always welcome - there are a few pinned issues in the webui repository on GitHub where you may leave your comments.
