The free version has everything you need for small companies or one person projects (eg blog).The UI could use some improvement but this isn't difficult since they are constantly improving it anyway! Great product if used correctly - don’t try deploying too many nodes at once otherwise performance will drop like hotcakes as their resources get swamped by requests.
Our team uses bit Ninja mainly because we want additional protection when using our own VPS's without relying directly upon Cloud providers/ISPs such as AWS EC2 services etc.