I own a 2017 13″ MacBook Pro, which came with an original 61W USB-C power adapter from Apple. After losing the adapter two weeks ago, I bought a PD2.0 adapter for 60W output from a Taiwanese company Acer for half the price of the original, and it works just fine so far! It charges the laptop quick and smooth, no sudden jumps and overheating as reported by @Kharski. Moreover, it's slightly lighter than the original adapter.
One note though: when buying a PD 2.0 adapter, make sure it can supply all the required power at 20V from a single port. For example, in my case I was looking for a 60W USB-C adapter. Therefore it must say something like this on the package:
USB-C Output: 5V⎓3A, 9V⎓3A, 12V⎓3A, 15V⎓3A, 20V⎓3A/Max 60W
Note that it can supply 3 ampere current at 20 volts, which gives 60 watt power at that voltage.
Beware of the adapters which provide less current per port. For example:
USB-C Output: 5V⎓2A, 9V⎓2A, 12V⎓2A, 15V⎓2A, 20V⎓2A/Max 40W
Total Output: 60W (max)
– this is bad! Because the adapter cannot provide all the necessary power through a single port.
UPD. Two years later, both my MacBook and Acer power supply still work together. No issues!
UPD2: I visited a Genius Bar and they told me that my battery is bloated. But I'm not sure if this was related to the power supply, because they offered me to change the battery for free. Apparently, it's a known issue for my model of MBP.