I can't get enough of the 40% Edge 540 in the G2 Add ons # 4. The size and physics are really good. Although it won't do a harrier, it will do a rolling harrier. I practice at least an hour every night with it -- sometimes 2. (gotta perfect my hover, ya know). Music really helps.

The Harrier Jump Jet is also a popular plane on Add ons 4.

I own all the volumes 1-4, and only really like the Edge for flying. The P-38 was good for "cool" but it got boring after a while. That was Add ons 3.