I've watched the site for a while because I have been thinking about upgrading from my KS-2.
I had my first Pentax Spotmatic in the 1970's and also bought an ES2 both of which I still own. My first digital Pentax was a K200D which I also still have. I was thinking about another Pentax until the aperture failure affected my KS-2 and as it failed at my youngest son's wedding I'm a bit off Pentax at the moment!
The KS-2 has been fixed under warranty, but I've read a lot about repeated failures..... Interestingly it's come back with a noise, like the one referred to here
Solenoid problem return plus sound - PentaxForums.com
I've asked the retailer about the sound and was told that it's a normal feature of the repair, an explanation which I'm suspicious about.
Suppose I should post this issue elsewhere, only intended to say hello!
Malcolm T