Between my wife and myself, we have the 100, 200 and 300 Sligshots. The larger is my carry-on hand-luggage for holidays; no way are my babies going in the hold for some half-baked baggage handler to throw around the airport. However, as convenient as these bags are for carrying, I find them a bit of a pain when changing lenses.
The problem is that when you pull them round to the front, the lenses are laid horizontally (facing away from you). It's a pity they couldn't design one that becomes a top-loader when it's slung across the front of the wearer.