This discussion is becoming rather shrill.
I never owned Pentax equipment before I bought the DS. Buying into
the system, I was delighted that I could use older, manual focus
lenses and get good metering support with it. No, I don't find it "as
convenient" to use K/M lenses as it is to use A and later lenses. But
K/M series lenses are 30 years old and I don't intend to buy many of
them, I usually buy A and later lenses because they do work better
with the camera. The fact that K/Ms work well with a minor
inconvenience to set the exposure is all upside however. It's not
difficult, it inspires a different picture taking workflow.
The biggest inconvenience to me, really, is that with K/M lenses I
don't have aperture or focal length data in the photos' EXIF info
with K/M lenses, and don't have focal length data with the A lenses.
I've become accustomed to having this data now and prefer not to do
without it, which is why I've migrated to using mostly AF series lenses.
Godfrey