On a sidenote: Please be aware that they didn't start free - I used them before their current pricing tiers and happily paid about about 25 € for their entry- or mid-level tier. Sometime after the new plans kicked in, I realized that I'd loose absolutely nothign by downgrading to the free plan.

It still sounds to good to be true, but I just wanted to point out that they charged for their service when they were much smaller.