You Curl-anyone tried ?

I have coarse thick straight hair and would like to sometimes have loose curls.My old,old curling tongs take forever and make ringlets which is not for me.
Has anyone tried Vidal Sassoon You curl?
http://www.vssassoon.com.au/tips/styling/usingyoucurl/default.aspx
What did you think?
Where can I get the best price?