* Frequent machines not working, random outages, builds not working
* Support wasn't responsive, didn't read my questions (kept asking same questions over and over again) -- I paid for a higher tier specifically for support.
* General lack of features (can't add sidecars, hard to integrate with external monitoring solutions)
* Lack of documentation -- For happy path its good but any edge cases the documentation is really lacking.
Anyway, for hobby projects its fine and nice. I still host a lot of personal projects there. But I have to move my companies infrastructure off of it because it ended up costing us too much time/frustration, etc. I really had high hopes going into it as I had read it was a spiritual successor of sorts to Heroku which was an amazing service in its day, but I don't think its there yet.