I've never registered a domain with OVH, my former employer & a few friends do and they seem to be very happy because of their easy management interface, DNSSEC & Anycast DNS for just 1 Euro an year per domain. Last time my friend had asked me to make some changes with DNS zone & WHOIS of his domain, I found that you could change details for domain owner but Admin & Technical contact had to be same as your OVH account info.
Have things changed now or are they same? Only thing I am interested in is ability to change email for admin & technical contact as I wouldn't like it to be same as that of my OVH account.