I have a K20D, and I'm presuming most of the other pentax models have this function. Just wondering if anyone uses it, and if so whats your thoughts? I haven't done any testing with it, but reading the manual it seems interesting, using it makes blow outs less likely.

If anyone uses it, does it work well and does it have any effect on image quality?

I'm heading out for a dawn shoot tomorrow so I think I'll give it a go and see what happens.