Hi grumpygi! I also have an Excalibur dehydrator now, but originally used the Yogourmet. It does eventually tend to overheat, but I got around that by venting the outer lid or simply leaving it off.
I hope spooky doesn't mind if I jump in on the question you asked her. You make yogurt in a dehydrator the same as you would make it for any other cooker/oven. The advantage to a dehydrator is that you can make a lot at one time. I often make three half-gallon containers at one time because our family of 4 all eat it and it goes FAST!
If your husband is still into dehydrating, I would definitely purchase this unit because you will get double-usage out of it! If he's not, and you are going to be the sole person eating the yogurt, then I'd purchase the Yogourmet. Unless, of course, you want to try the light-bulb method that spookyhurst mentioned, or the heating pad method. Basically, you just want some way to keep it between about
105 and 110 degrees F for 24 hours. These two methods are explained on the SCD website.
We make smoothies with our yogurt, adding fruit (bananas and orange juice are a favorite), and sweetening it with honey. I also like to add a couple of drops of "legal" vanilla. We also like the yogurt plain and unsweetened used as you would use sour cream. Believe it or not, it's awesome on cantaloupe! I chunk the cantaloupe, salt it, then top it with yogurt! mmmm...mmmm...mmmm...
If you try searching this forum for "yogurt", you might find some more discussions on it!
I hope that helps!