Less weight is better. I've opted for the DA50, new and delivering, because it only weighs 3.0 lbs. Also, opted for another first, Li-lion batteries...2 equal 2400 mA, but may use an existing pack (NiCad) 4 cell at 1100 mA for the engine electronics. The WM 300S is a well made kit. Going together great...everything fits.