I tried them in the past but owing to a mistake on my part and not having Calibre set up properly I couldn't use the ebook I bought so I deleted my account.
Thought I would give them another go as part of my move away from Amazon. Signed up OK attempted to buy a book and my card was declined (even though I know my account is OK). Fine better sign out check my bank account and sign back in - nope won't accept my password now

Ok thats fine do a password reset maybe I wrote it down wrong (know I didn't) nope won't send a password reset link
Sent them an email and asked them to delete my account, I'm obviously not destined to use their website!
Hive.co.uk worked fine though!