Be advised though, I always lost any added annotation to my line labels if their geometry changed. They would revert back to the basic labels style assigned to the line and the desired annotation had to be entered again.
I think Autodesk "sort of fixed" that problem. You can move the line around, and it does not kill the override text. However, there are many things that still kill the override text, such as changing the label style.
There is also a horrendously nasty problem that can arise when editing Parcels (which may only happen if you use Polylines to create the Parcels, or it might happen all the time - I'll have to do more experimentation to find out). You can really see this problem if you label your parcel, then convert a couple of the labels to tags. If you then perform any edits to your Parcel, such as adding or deleting segments to your Parcel, the tag labels will "jump" to adjacent segments.
Parcel Labels are horrendously problematic. It is very disturbing. This thread was actually very timely, because I was in the process of printing out mylars of a recent plat (three copies - don't ask why they need so many mylars). I had just finished, and then remembered I had done just this sort of edit to some Parcel labels on this plat. So I checked the mylars, and sure enough, those edits were GONE. Thank you again, C3D. So, I got to spend 15 minutes going through and re-adding the text overrides, then reprinting three mylars, and throwing away three bad (and expensive) mylar prints.
This sort of things is WAY too common with C3D. And we now have very serious doubts about Autodesk's ability to fix all these problems, since they are so darn slow to do ANYTHING....