Other: Because you can use old lenses. Not that mine are anything to shout about, but I just liked the idea of being able to use them, particularly the Tokina macro which is my only really nice lens. I was feeling guilty for having bought it and then hardly used it because I was getting sick of the expense of film and processing. Plus I love manual lenses, they just feel good! And I'm a bit of a Luddite. That's a bit oxymoronic, isn't it, a Luddite with a digital SLR?
There were a few other considerations, too, so here they all are in order of importance:
1. Compatability with old lenses.
2. The Pentax reputation (my much abused K1000 still works).
3. Price.
4. The feel - it fits my hand, it feels solid.
5. Everything else about it: AA batteries, small but sturdy, viewfinder, easy to use... I could go on and on!
This is all separate from the digital consideration, getting free of film and processing and getting instant feedback. Wonderful!
Julie