I doubt if the fees are just zero, otherwise how do they make money and sustain business for years.
They advertise themselves as zero fees, but in one part of their website, they say they do not charge fees on any tx for the first 3 months of a customer using their service. I think they are trying to attract people with the 'zero fee' thing, i don't think i trust this service.
I've gone through this for a short time, and that's a lot of complaint there. I don't know if op is still interested in using this service, cause they have not replied in this topic since it was created, however i would recommend that op should pass this one, and look for another service or use BTC.