We're using a DJI Phantom 4 to do some water tank and cell tower inspections. The DJI is super easy to fly and the app to run the software is free on android or apple iOS. There are some great tutorials on youtube that will run you though what it takes to fly one of these. The hardest past will be trying to figure out if you need to be licensed or not and at what level. The FAA recently made some changes and we're waiting on a call back to see where our use fits in.