I'm the CEO of clever cloud, and and try to give you severals arguments :

- We handling provisionning in our side : the app will scale up and down automatically, related to your real needs

- Our pricing is base on real consumption : what you really consume on our resources, due the auto scalability feature

- We have a good performances reverse proxy ;-)

- we support a lot of platform

- We're not based on AWS (down 6 time per year) and we provide a friendly EU laws compatibility

- we are responsible of application running : if your app fail, we will restart it automatically

- we provide file system support (VERY usefull for php apps) in a clusters way

- we are cheaper

- We are cool :-)

At last, we are trying to make a new PaaS with other features and another vision, with a lot of respect for the Heroku work

If you want you can mail me on quentin.adam@clever-cloud.com explain your project and I will give you what you need to test it and answer more precisely on your case :-)