Have two450 home assembled quads w/ sunny sky Mtrs. 1st bird has 1250 Kv Mtrs, 2nd has 1400 Kv. little over the top w/ 30amp Turnigy plush esc. Kk2 ver 1.5. 2200 3s lipos. Got very leery and super short time in the air. Need better charger to balance the cells. Got total of three hubs an x4. Learning stick control. Very addictive . Those x4s' take hard landings very well hope to learn much from those with more 'air time' . Thanks in advance for you s , that share your knowledge thru experience. Ltr. beam me up.