I bought two of these dellas today and they both immediately paired up immediately after I inserted the battery. I added no DH or anything so seems to be recognised natively.
Pressing or holding any of the buttons reports in the app immeditely under the device recent tab so all seems to be working perfectly.
If I use the Lighting Automation smart app to try to switch various things on/off they seem to not work at all for the most part. One I added does work somehow!.