I've owned & flown about 100 flights on the the original Focus design and have 200+ flights on my Focus II. The II is superior, although the Focus I is a fine bird. I found that the II snaps cleaner, spins more surely, is almost bulletproof in hammerheads, rolls a little more cleanly and with slightly less pilot workload on slow rolls. Sure the YS will pull it. However, I can recommend using an O.S. 1.60 with a VP30 pump. Others just use pipe pressure, but I like having the pump. Absolutely flawless performance, spins a Lockhart modified APC 3 blader at 7800 (more vertical than pull than need), costs about $250 and has much less to break, wear out and nothing to adjust except the carb. This combo gives me 14 minute flights with a 20 oz tank of 15% (2 full trips through the '05 Masters) and very consistent speed throughout.