Their annual domain registration prices appear to be 50-100% higher than many other registrars, so I'm not sure how "free" this is...
Also I found your web management interface to be difficult to navigate. I often had to go looking in your KB to find answers for how to do simple things like update A records (Namecheap does this much better).
The one positive thing I will say from my time as a EuroDNS customer is that you do allow people to register European domains that require residence, acting as the Technical contact for customers who are not living in Europe.
But overall, the higher prices and below average service weren't a compelling reason to stick with you guys. Other registrars like Namecheap also offer free SSL certificates for new registrations and multiple DNS servers.