i have had both, 1 35% SD yak and 2 QQ 102's. all with DA 100's. the SD is a bigger plane and flys bigger but i was not happy with power to weight. it was not what i wanted but did fly very well and was well built at just over 30#. the QQ's come in around 26 - 26.5 # and pull out is awesome. while it doesn't fly as big as the SD it is very close and service from QQ Aircraft is the best around. the QQ comes with composite wing and stab tubes and light landing gear and the optional hardware kit is very good. with the SD you should replace the landing gear and wing tubes to save weight + the gear is a very soft alum and bends very badly. not trying to flame the SD just calling it as i saw it, both are very good planes but when i kill my QQ i will replace it with another QQ 102.
randy racer