Never thought I would buy a glass top stove. Surprise! Found this slide in model that looks like a built in. My big plus is the 5 options for varying sizes of pans and heat including a warming ring. I haven't gotten a power bill yet after my purchase but am assuming that I will notice a difference due to the unique on and off heating elements. I use cast iron fry pans and Dutch ovens a lot. Always thought they would be a no-one on glass. Read up on the cooking instructions included, checked my pan bottoms for smoothness and have used them successfully.  Just had to adjust technique to lifting pans instead of sliding them. The stove top is so easy to clean, especially with the recommended product.