I bought the sdr370 for over 900 us dallars. The naza v2 does not work at all. No gps. I took it in and numerous hobby shops said I got ripped. They never offered to help, all they say is send a picture. I am so sick of hearing that. I have a very big mouth and I will tell who ever I can about this company. I feel I got totally ripped off. I wanted them to send me a new unit never got a respond and I'm not out for a handout but I spent 900 plus for it. And the GPS does not work at all. I got a lemon, and I read other reviews and heard the same about the gps. It's like they sell street fair $#*!. I will make a good utube video about my story so others don't Germany ripped off. I always thought they were smart and intelligent people but I guess not. What comes around goes around and they will realize that someday. Thanks and sorry. Andy kiefer