i have all three - DA50r - ZDZ50ng - mvvs58 - the two light weights are absolutely the same on power and identical exhaust - the DA has been back for crank problems - the ZDZ starts more complicated but has much better transition - the 58 smokes them both so bad you cant even put them in the same league - i think the mvvs 45 is a perfect match for the two 50cc engines - the zdz is in a aeroworks katana at 18 lbs - the DA is in a chip DV 16.5 lbs - the mvvs is in a yak toc/AM 30% at 17.5lbs- all the planes have there own caractor and all fly great - the mvvs is a step ahead - the zdz has the best throttle response i have ever seen - and the da is great - what i will buy next is the mvvs/evolution 45!!