We started this project about four years ago thinking we were going to snake wires from our surround sound behind it. We were having problems (we thought) with the saw we were using. We found out it was with the particular crown molding we bought. Every time we made a cut at the corner of a room we had a gap. Our solution - spend more money for these groovy corner pieces.
Now we are only stepping over one twelve foot long piece of crown molding when we walk in to the bathroom instead of a small pile. That will be gone soon and at least the project is done.