We used to use it. It was horribly expensive. We were paying ~300 or 400 euro for a simple service, log storage, SSL, mysql, and three pipelines (dev, stage, prod). I reduced costs by a factor of 10 when moved from Heroku to bare metal. As a bonus, we got twice more horsepower. Not that I recommend using bare metal for unexperienced users, just there are better options. I'd say avoid, unless their free plan fits you and you know you won't exceed it. It's also a proprietary solution compatible with nothing.
PS that was in 2016, don't know about their current pricing.