Loc: Portland, OR
Since you are asking on a backpacking website, I expect you are thinking about using your drone in a backcountry setting. I can't recommend a drone for you, but I think it is worth noting that drones are banned from all designated wilderness areas. I am not certain about national parks, which often have local and unique regulations. National forests, to my knowledge, do not have different regulations than the usual FAA ones.
Forbidden for a number of reasons. If one goes down it will most likely be in a hard to reach area where recovery is dangerous or impossible. They can go down in closed areas, and wreckage must be recovered, regardless. An expensive prospect. People don't like the intrusive nature of drones. Wildlife can be effected in various ways.