My fiancee Liz has been fighting a long battle to keep Beowulf from getting under the couch (using lemon juice, balling up sheets, and now putting thick books under the crevices). However, today, the cats discovered the top of the couch and, as long as they stay there, we're happy.
They've spent a lot of the day climbing the couch and stretching out to nap on it. It's just too cute to see them like this.
BTW, no problems with them scratching the furniture or leaving lots of hair around.