Now this review is born from frustration. I actually have been with one.com with three different websites for over a decade... but the prices keep rising and One.Com is now expensive and to be frank: Not very flexible. I wanted to change.
Leaving One.Com is really difficult. The bureaucratic hurdles, the unwillingness to be supportive... and I have never met a company that makes it so hard to simply change the domain name to another registrar as One.Com. They want to see everything, including your ID, and will deny the transfer on the weirdest charges.
They have my ID, my company register experpt and my home address. They still want me to print out an application form, sign it and send it off - to be replied to very slowly, with a denial, because the eMail address in the registry form isn't.co.uk, but.uk.
To be clear: They have my ID at this point. Phone number. Address. Company registry. Everything. But the eMail address has a wrong ending, and they want me to fill the whole paperwork again, send it again and wait another day for approval. For switching a domain to another registrar, a process that works effortless and without problems with any other company on the planet.
So, bottom line: Pricy. Bureaucratic. Unhelpful. Avoid.