Speaking only from other's reports: I hear the Sig Hog is a great flying bipe, from docile to extreme, depending on what you like. I have yet to build or fly a bipe, but can't wait to do so! I have a Midwest Super Stearman on the shelf that I have lined up to complete. Unfortunately, I have more projects than I have time! I like flying the GP Ultimate on Realflite simulator, and have also heard the Goldberg Ultimate is a great flyer as well, but it sounds like the Hog is a little easier for a first bipe. No doubt there is an attraction to having two wings!