Prefer to use Uber than local taxis in most cities I travel to. Here in London (Abroad for some of you), I recommend it over black cabs. It's a little bit of a pain to get a ride at LHR but only because of the waiting time, as they tend to park outside the airport and can be a 10-30 minutes wait until they arrive to the pick up point. Around the UK is pretty much the same: Cheap, easy, reliable. Used it in Belfast few weeks ago and was lucky with the cars, first ride was on a Tesla, then the rest were Mercedes.

Another city I use it a lot is in Panama City (Panama). Highly recommend it if you're visiting the city. Most of the drivers speak English as well. Taxis are not metered, they are shared (so they can pick up people on the way), and tend to charge tourists more than locals.

I was quite surprised with how good Uber was in Kyiv (Ukraine). Friendly drivers, but they don't speak much English.