Been using it a lot in Hanoi. I want to do a certain amount of walking but it's nice to return to the hotel for about a dollar from a couple of kilometers away.
They navigate through all the swarms of scooters (which you have to do on foot whenever you cross a street) and they got the AC going.
I don't know how the economics work at a dollar a ride. I've left bigger tips at the hotels than a lot of these Uber rides.
I went on a tour and the Vietnamese guide said that average incomes are $2500 and scooters are about $700 while cars start at $20k, apparently because of taxes to discourage car ownership? Maybe used cars are much more affordable.
GrabCar is even cheaper and appears to be in the smaller cities that Uber is not in.
If I already didn't have my credit card in Uber, I probably would have tried it out.