I just used Uber a bunch while on a mileage run to SGN.

My hotel offered me an airport pickup, for USD$45, while the cost of the Uber was maybe $4.

I did a couple of UberX rides, they were mostly around $1-2, but took forever in the mess of traffic.

Then I decided to try Uber-Moto, where you ride on the back of a motorcycle. The driver does provide a helmet.
It was pretty scary at first. Heck, I nearly just got off, but I'm glad I stuck with it, as after a couple of rides it felt almost natural.
Min fare was VD10k, about US$0.40, with most under VD20k.

I'd recommend picking a short trip in nice weather to get your feet wet, so that if it does rain (and chances are high it will), and you have crazy traffic.