I have done 2 of these and really like the way they look...on the front! Like you, it was an interesting wobble on the back. I found that by using thread in the bobbin that matched with both the backing and the binding it looked a lot better. I also got a walking foot for my Janome because I can totally control my speed with it and not so much with my old trusty Elna.
I like the idea of using the glue instead of pins because when I take a pin out so I don't run over it with my walking foot, the material shifts on me. I will say, my second effort looked better than my first (and I didn't rip out anything!), but I am really looking forward to doing bindings completely on my Janome.
Guess it is like anything with quilting, the more we do it, the better we get and the better it looks! Remember, those posting the tutes on this have been doing it for quite a while and they certainly are NOT going to show you pictures of their oops!!!