It's in a weird place between heroku and lambda. If your container has a bad startup time like one of our python services, autoscaling can't be used as latency becomes a pain. Its also common deploy services on there that need things like health checks (unlike functions which you assume are alive), this assumes at least 1 instance of sustained use as well, assuming you do minute health checks. Their domain mapping service is also really really bad and can take hours to issue a cert for a domain so you have to be very careful about putting a lb in front of it for hostname migrations.
I don't care right now but the fact that we're paying 5x in compute is starting to bother me a bit. A 8core 16gb 'node' is ~$500/month ($100 on DO) assuming you don't scale to zero (which you probably wont). Plus I'm pretty sure the 8 cores reported isn't a meaty 8 cores.
But its been pretty stable and nice to use otherwise!