Bought one from aotastore for $79.99 (now $59.99). It was clearly used and a bit scuffed up. First problem - Magnetic Interference that would not go away. Disassembled and checked everything and did a factory reset. Problem fixed. Seemed to be ready to fly until I discovered that two of the four motors had damaged prop shafts and all have bad bearings. Appears to be shipping damage. The Solo was shipped in a big empty box with zero packing material Bought a second one from titan.deals for $75 that was supposedly a Best Buy return. Came in original box (no damage) and it looks like new. First problem is solid orange led - won't boot. Pulled SD card and found it has a R/W error. Flashed a new image and it seems to boot now but won't connect with the controller. Need to try a new SD card because I suspect the original one may be bad. Both of them came with REV B GPS's.