We have one flying at our field with the ZDZ 50 NG and GWS S11 servos. It flys VERY well and has unlimited verticle. The S11's are strong and cheap and have held up very well to some good abuse. The plane was originaly flown with a ZDZ 40 sportsman, bit was lacking on power when trying some of the more power hungy manuvers such as snaps on verticla up lines etc. Other than that it flew great.