The Simply Magic is very close to the Magic Extra. The made the wing about an inch wider and added the cowl. There was another change but I don't remember what it is.

Here is a link to the [link=http://media.hobbypeople.net/manual/123742.pdf]manual.[/link]

They took the info page off the web but you can get most of it out of the manual. I like to keep a .pdf copy of any I can get, that I own.