I like the idea, but I use 2 Fotomans to get around the problem, and my buddy has 3 Fotomans. With darkslides, you still have to change lenses.... the part I don't like. So I grab which camera I need, and shoot, like the old days of carrying two 35mm bodies. It's about convenience, if I needed another I would also have 3, but 2 is all I need.