Just finished maidening my first jet. Tornado with a K-80. Very steady and reliable flier. Slows down nicely. I think you would be wise to assemble your first jet rather than buy a used one, because the installation will force you to learn about how this machine works. It's more than just putting a fuel tank attached to a carb by fuel line. An assembled jet doesn't give you the hands on experience and the understanding of the process. The Tornado is a bit of a pain to assemble at the field, but fortunately is does fit in my Town and Country and Henry at Modelbeau is very helpful with any of the questions you might have