I don't think it consumes a lot of electricity. In fact, it makes stuff really fast, faster than a blender.
We haven't used an actual blender for 8 years. You can definitely get rid of the blender. Blending is the easiest thing that the vitamix does. It's the making of ice cream and soup that boggle my mind. How can one machine make hot soup and frozen ice cream. It's amazing! But it works. And so quickly too.
I haven't tried to make chocolate soft serve. But there is a recipe in there to do it. I usually make strawberry soft serve and pineapple soft serve. Those are the best, in my opinion.
Okay, one time I made the pineapple soft serve, and ate the whole thing in one sitting! It never made it to the freezer. Don't tell DH! He thinks I conveniently forgot to make it after I said I was going to.
It is expensive, but after 8 years I can tell you this machine has way more than paid for itself. Plus it's self cleaning. Or you can rinse it while it's still wet and it cleans so easy.
Also, you can make nut butters really easily. Just put peanuts in the vitamix and in a minute you've got peanut butter. I make a cashew cream pie mixture in there that requires the speed of the vitamix to make it come out right. You drizzle in the oil and that helps turn the cashew cream all thick and rich.
Anyway, I'm not sure how to convince DH... that's a toughie. It's a lot of money, but it will bring you a lot of pleasure. The vitamix sits on our counter... it's the only machine that gets to stay out permanently. The rest of em are in the cupboards.