Well, they are mor or less the same on all the Pentax dSLR camerars when using M42 lenses. You can use Av or mode for metering, there should be focusing confirmation. Better use original Pentax M42 adapters if you can find one, 'cause you don't need special tool to remove it from the camera, just your fingers will do the trick. For third party ones, most likely you need a special tool (usually comes with the adapter) to remove the adapter. Not really a big deal, but abit troublesome.
If you can find an original Pentax adapter, go and get the one selling at FotoGrafix in Chinatown Point. It's not original Pentax one, but built quality wise is similar if not better.