I have Service Pack 2, and the text is still very glitchy. Here's a few things I'm finding:
1) When mirroring text in up/down configuration, justification changes to opposite side from original text. Not a deal breaker, but one more thing you have to manually fix when duplicating notes symmetrically around the view.
2) Content that is copied from one existing text and pasted into an existing text (to update a series of notes with new content, etc) the pasted text does not appear in new text until you click off the text, then you see it. This is bad. Really, really bad.
3) Text is severely slow to respond to keyboard. Have to wait 1-2 seconds before you can start typing. This is like an anchor around the neck of productivity.
4) You can no longer grab the text by the edge of the frame to move it (like 2016 and prior). Rather you have to exit the text command with the move command, etc. Not referring to "repositioning" text by grabbing the + and keeping the leader in place, but moving both the text and the leader together.
This feels like Revit Text took one step forward, and many steps backwards. ???