I've recently signed up for Realms Plus for my wife and her friends to enjoy from their Switches.
We've tried spending a bit of time building in the new realm and, while things are pretty smooth for my PS4, we're finding the Switch experience to be quite frustrating.
The biggest issue that makes this unenjoyable:  After a while of playing (amount of time seems to be random), players from the Switch are unable to do anything to change the world.  She can still move about, and I see her move around from my PS4, but she's unable to interact with the world.  The UI is replaced with the loading bars and they do not seem to go away.  During this 'loading', we are also unable to open the Minecraft menu.

We can close and re-launch the application to gain some more play time, but eventually it freaks out again.

Other things to note:  From the switch, it sometimes lags a bit:  New chunks take a while to load, removing or placing blocks is lagged, sometimes by as much as 30 seconds, and attempts to close the application hang for a bit before reporting that the application has been closed due to an error (closed because of an error that happened when I tried to close it‽)