Can't believe no one has stepped in yet. YA is a very different beast than the JHH. I have seen both in the air and they both appear to be great flyers. However, a friend of mine just purchased a BVM F-4 and it is just out of this world, but I don't think an 18 pounder will do.

If I'm not mistaken, the JHH F-4 has a "build as required" type of instruction manual, where as the YA should be more thorough. A buddy of mine (jkirkon) is buidling a YA F-4 as we speak and he's loving it. If you go to my "My pimped YA Falcon" thread you will see some pics of the F-4 being built.

That's all I can say.