I have the same questions! I am really interested in the Fly Model Sbach or maybe the Yak55... My main problem is I cannot seem to locate any Assembly threads (Kits are Builds) and just as important, reviews or at least a flight report... I saw a video of the HK one and it is very impressive! I am also VERY interested to know if I can make an OS 1.60 work instead of the 30cc as I have a new one here ready to go. As of today, I have cash in hand to buy one and don't really know where or what to buy. I might just pull the trigger on the Fly Models Sbach or the YAK55, I like them both!... Good Luck to us