I bought a programmable one several years ago, and I really did not like it. I went back to an OLD rival crockpot with the stoneware insert. The new ones seem to cook so much hotter that I finally gave up and went back to the old one. Then my daughter wanted an older one, so I found her one at a garage sale.
If I remember right, I wanted the programmable one to let me cook on high for several hours and then switch to low, but it wouldnt do that. The high setting was too much for all day, and the low setting didnt have an 8 hour button. OR something like that. IT may have been that I am just not good with change....LOL