I love this music, its from Romeo and Juliet too isn't it? I was considering it as my entrance song as its a song I have always loved. The version with the words in by Desiree is beautiful but just the music on its own is stunning. I think its a very good choice.
I know what you mean about the part where it 'kicks in' and it would be nice to make your entrance then too. The only thing I would suggest you think about it that timings may not run very precisely on the day. I was MOH for my best friend last year and there were 2 other BM's, we were supposed to take a certain amount of time each to walk down the aisle but it totally went out the window. The first BM went too fast so the second tried to go slow to make up for it but ended up being too slow and then when I went I couldnt remember what I was supposed to be doing lol.
Love the music though, I could gush about it all day long!
x