AirBnB is at least as useful as Uber if you travel. I've used it for multiple trips in five countries now and always had a good experience - the accommodation is always what was advertised, the user interface is easy to use (especially when in a country with a foreign language), and the pricing has always been competitive. I do have concerns about the impact of it on locals but I'm also not sure that AirBnB is exerting more pressure than many places have always had from other factors (tourist towns always have a balance between tourist prices and locals trying to make a living - more often than not that balance tips in favour of the tourists).