Yes, we have one and I gave one to my parents when they became grandparents, so we could sleep the whole family in. Theirs is 5m diameter, sleeps more than 10 people plus stuff. Ours is 4m diam, more cosy and fits in our garden. But don't go to that website to get it, we got ours from a dutch company, Obelink : their website is here somewhere.......aha!
Look at this page to see the Sahara 400, the one we have. Very cheap, 159 Euros. My daughter loved it all summer, but the lawn sadly didn't, not sure what to do about the strange mossy patch this year, probably just put the tent up again!!
By the way, the tent we have has a removable groundsheet, but I think this is the link for the type of tent with an attached groundsheet, it costs more and is probably not so draughty, but we like fresh air and being able to roll up the sides on hot days.
Other links:
The Sahara 500 (the 5m diameter one, very nice and airy inside)
The Sahara 500 plus - with an inclusive groundsheet
Good luck! We love camping in ours, excellent for festivals and our daughter and her cousins LOVE it.