Their managed solution is pricey and especially the linear scaling with how much you use it is very meh. It's comparable with AWS lambda which also isn't cheap. However it's minor on a typical cloud bill.

Self-hosting is very easy in my experience, I've done it for 2 years but management wanted to move to Temporal Cloud. They have a helm chart which just works including upgrades. This does assume you have the whole k8s shebang set up and working in your company. I never had to touch is outside upgrades which took maybe 30m including validation.