I did finally get my buddies Align gyro to work well enough for hovering after spending a lot of time on it. I made a single adjustment to my 401 after install and it's been perfect as I expected it would be. I have the 401 on my Raptor 50 as well and it's perfect. Easy to setup and works flawlessly. You won't be sorry if you get a 401. FWIW, I got a 401 and 9650 servo from my LHS for $150. Look around you might be able to find a really good deal.