I don't know about "well", but I'm sure it works. I bought the following to try to come up with some sort of portable docking station-type solution for myself, but I've been less than successful thus far:
Batpower P90 Power Adapter
Now, I like this power adapter since it will supposedly do up to a total of 90Watts output and includes a QC 3.0 and regular USB 5v port as well. Now, this is still well below the total output capable from the already underpowered OEM charger for the 15"... But, I was thinking that it would be ok, so long as I wasn't slamming the SB2 with insane workloads while on the road.
However, I've had a few issues with getting this all to work. For one, the USB-C to USB-C they shipped with the adapter seems a little flaky. Secondly, it's almost impossible to find a multi-use USB-C adapter with HDMI and networking that supports these kinds of power inputs for USB-C passthrough charging. Most of the USB-C multiport adapters that I've seen max out at around 60V input on the USB-C passthrough port, so you're almost guaranteed to burn one up using this charger and one of them together.
Now, just using the charger with the SB2 by itself? I've had no problem at all. Works like it should and it's about as strong as the OEM charger, but not quite...