The remote control unit is fantastic and eventhough you can fly the Spark without it, it is basically impractical to do so. App crashes.. limited range.. difficult to see screen in daylight etc.. The service from Amazon and vendor is fantastic. However, I am very annoyed at DJI because I forked out $650 for the Spark drone by itself, and less than a month later they are including the controller as part of the package for a similar price!! Luck of the draw.. So anyone reading this review and not purchased the drone.. look for the package deal. Those of you like me and realise you need the controller, then I highly recommend Amazon and the vendor.