Clanad is one of the most well-respected contributors to this site and his answers are usually 'spot-on'. However, he's in the USA so it's not surprising that he's linked to a US site. If you're in the UK should be aware that UK sizes, with the same names, are generally much smaller. (Also, most UK stores don't use the term Queen size).
I only know this because I remembered a post from over a year ago, which resulted in Woofgang providing this link:
http://www.here-be-dreams.com/bedroom/bed-size s.html
You might find the whole thread interesting. Among other things, Ursula62 explained why most UK stores no longer
recognise the term 'Queen size':
http://www.theanswerbank.co.uk/Home-and-Garden /Question144129.html
Chris