Tried removing a background from a stock car photo. It involved quite a bit of precise mouse wiggling and the end result was still pretty sloppy looking. I assume there are cases where this works well, but it would probably help clarifying what those are before inviting people to try the tool out.
Cars can be very tricky - the lines need to be very sharp, so there's no tolerance for blur. I used to mask and recolour car bodywork in Photoshop as a freelance job, and hand-drawn spline paths with the pen tool were the only acceptable solution for professional use.
