Fucking brilliant. Less than half of the cost of Tuk Tuks or off-route Songthaews.
There are 200+ drivers in CM now, and they mostly appear to be women.
You order the car, watch it coming on a map, get in, go to your destination, get out.
No fumbling with notes, no tipping and the longest I had to wait was six minutes.
There is a big board at Central Airport listing the fees, and the tuk tuk drivers just laughed and told me "No it's 150 baht".
So I said "Fuck you, No wonder everyone uses Uber" and walked off to them begging me to come back and pay the Bt100 that was on the board.
Took three minutes to get a car and cost me Bt67.
I'd recommend it to anyone.
If you want to use Grab it's a bit more pricey, but you can book them for a particular time, e.g. if you want to go to the Airport.
Spread the word and let's put the crooks out of business!