Nothing too significant, no noticeable change in utilities. I was skeptical at first too but I think it's just so well insulated that the initial boiling takes a lot of energy, then maintaining just below boiling is low-energy.

I have a newer one, it has never boiled over or had any other issue, is easier to clean than previous rice cookers I've had, and automatically senses pretty much everything so it's difficult to make mistakes. Honestly a world of difference between the ~$180 Zojirushi and my old ~$50 Aroma, I wish I'd known sooner.

Their water boiler has changed my life. No more forgetting the kettle or microwave, just tea whenever I want, right next to where I'm working.

It's up there with bidet (seat type, not separate fixture) on best "extra" home appliance purchases, for me.

I have a newer one, so no proof yet--but got a strong feeling it's BIFL on the first use. It has the feel of a masterfully engineered product. I have their boiler too. Worth the expense!