Originally posted by Hiryukaen:

Valheim Plus is prone to being broken upon most of the updates that Valheim receives, which can mean you get stuck waiting for updates or risk some problems with your world if you've chosen to increase the build height or other major changes.

This is true, and true for a lot of other mods too. They're pretty good at updating though and the wait is usually only a few days. Be wary of increasing inventory size or anything else that can cause problems if it suddenly disappears, or needs to be turned off. I lost a few items when moving to the test server that way. But overall I think the pros outweigh the cons.