i am new to this site so please go easy on me see how most of u are talking about the helimax cpi have one also i have two walkera helis df4 and df60 upgradedmy df60 has give me the most problems but sence i upgraded it with cnc head and tail,bhless motor and esc and lopoly battery no more problems i think all helis have to have the bugs worked out i love my 3 helis mike