I have one of the
Uneek4x4 Flip tables fitted, and whilst I don't use it a lot, when I do it's very handy.
When camping or travelling, it gives you a little area to either use as a table to cook things on, or just prepare your meals on.
They don't give you a lot of space on the JK, but it is handy, and doesn't take up much space either when folded away.
If I had the choice again, I'd still buy one.