What do you like best?
The ease to set-up a blazing fast environment is pretty awesome. Whenever you're stuck or having an issue, just head to their Slack and you'll be guided by one of the best support-desk I've ever experienced. Platform.sh had the luck to have one of the greatest Drupal developers on board (@crell) and since our agency is specialised in Drupal, his support is greatly appreciated.
Besides the huge skillset each and every employee has, they always answer the questions with a slight sense of humor. Very pleasant to work with!
What do you dislike?
Their support (tickets that is, not Slack) is mostly superficial. "It's fixed" is an awesome answer, but sometimes I would like to know the reason why and a more profound answer.
It's hard to get a clear view on the used disk size. There are some tips and trics to see an estimate of the disk size, but mostly you depends on health warnings (sometimes it's already too late).
Statistics and analytics would be awesome too (track slow processes, see the server load on peaky hours,...) In general, get more insight in your app!
Recommendations to others considering the product
Go to their Slack and ask around! It has multiple advantages to ask about it.
What business problems are you solving with the product? What benefits have you realized?
Benefits: automated deployed, increased our security flow and provide clients much faster with a stable platform
Problems: Not all Drupal sites are fully supported (e.g. multi site) and we cannot see the disk usage (only estimates), so it's hard to know when to upgrade.