After much contemplation, finally sprung for the P4. Picked it up on Thursday. Unboxed it at home to discover that the battery that came in the box wont do anything, no indicator lights and nothing happens when placed on the charger. Fortunately, I had bought 2 spare batteries which seemed to work fine. Went ahead and did all the updates Thursday night and went out to fly it yesterday afternoon. Got about 23 mins of flight time but kept getting a VISION SYSTEM ERROR. Video was all choppy but thought maybe that was a computer issue. Charged everything up and went out this mornING and now can't get more than 15 feet away before it loses signal and RTH. Spent the whole morning reading forums, calibrating, and backing up software versions, still no joy. I f someone has some ideas I would be happy too try anything, otherwise I will take this POS back where it came from!!!