buy in

  1. H

    Is it meaningful to sell out P3 pro and buy in P4?

    Hi! I have bought one Phantom 3 professional in last October. I am wondering if I shall sell out my P3P and buy in a new P4. I like the new features ''Active Obstacle Avoidance'' and ''Auto Follow'' in P4. However I am not sure if these two features are practically useful and value more money or...