Hi
Im with Yell and book, and it works ok for me. Hav'nt been offered this yet though.
Sounds more like a bit of a money spinner for Hibu to me.
I'd try it for less, 'cause u never know, but £20 a month is a bit steep I reckon.
Can't see how it would give u that much extra to make it worth it.
Saying that, if u do try it, let me know if its worth £120 extra for 6 months.
Rich