Writer Retreats: Good?

So one of my publishers is sponsoring a "Writer's Retreat" and I'm contemplating attending. They never seem to be anywhere close to me, so I would have to fly. Plus hotel, taxi, etc... So it's going to cost me about $1000.00 all told. That's ALOT... ALOT. So my question is, has anyone ever been to a writer's retreat and do you think it's worth the expense?