This is probably my favorite lettuce. I hate the white core parts in iceberg lettuce, and you just don't get that with butter lettuce. A head is nearly all green leaves. I like the flavor -- it pairs well with every kind of dressing, and because the leaves are small, only needs minimal preparation. You don't have to shred or chop it for it to be eaten easily. All you have to do is tear the leaves into smaller pieces and you're done!
It's more expensive than iceberg, but in my opinion, is a much better buy since you can use much more of the head than you can with iceberg lettuce.