Some drawbacks and limitations are If the drone is going to fast then sensor won't read it because the drone will pass by between the detection times. The wires are a little over the place so the drone could get caught in the wire and rip them out. The whole system is fragile, so it can't be moved around too much, or the wires will come apart. Some ways to remedy these issues are to. Protect the system by encasing it in something. Ramp up the readings per second.