yes it doesn't work that great on the SP3... maybe MS will fix it with a drivers release in the future... one can only hope right? but at least everything else works!
It supports the standard Bluetooth keyboard/mouse protocols -- or at least what they were when it was made, not sure if newer versions of those protocols offer multi-touch mouse functionality... Regardless, the wireless keyboard adapter has been discontinued -- you can still find them, but no longer at the Microsoft online store.