I've got the digital holster 20 for my D300 and it's a fine bag (I use it most often with the crossed shoulder straps so that it rides on my chest). Really well made, but pretty bulky and heavy for us "ultralighters". Takes a few moments to get the camera out and ready to shoot from it, compared to my friend who always just carries her Canon on its shoulder strap and has it at the ready constantly.

The holster keeps it much better protected, so it's a trade-off.