.. kept crashing on me too. It can't open the pentax raw format, but I switched to the adobe format and it works fine... though a bit slow and I have a decent computer. Still, I prefer it to pentax photo lab... I think mostly because in photolab everything looks really low rez and crappy and I can't tell what needs to be adjusted. Makes me feel like all my pics suck, when really they just aren't that great

Additionally, I think that raw therapee is very intuitive, I haven't read the manual yet though I'll be reading it soon.