I tried Clipping Magic on a tricky image where the foreground and background were a similar colour in places.
It didn't take long to get the basic idea of only roughly indicating what is foreground and what is background. Clipping Magic got it right almost at this first attempt. A few more rough clicks (not painstakingly at all) corrected it. The whole process was so quick I didn't realise I'd finished at first. The cut-out was perfect, including hair, and I didn't have to tweak the options at all.
I estimate it took me under a minute to process the image in Clipping Magic, versus five or so in my normal graphics program. That might not sound like a lot, but would soon add up if you have many images. The results were better too.
This review is based on Clipping Magic as a free service - it might not stay that way.