I purchased a set of three of the "mixing bowls" and "medium mixing bowls" the last two times they were offered here on w00t.
While I agree "mixing bowl" is a misnomer, they are a heavy, good quality bowl. These bowls are best suited for use in setting up your mise en place or for other food prep. When I cook I will prepare things like diced onions, diced peppers, sliced mushrooms, etc. and put them in their own little bowl before I start cooking. That way all I have to do is dump them in the pan at the right time. I have also used the bowls to crack eggs into prior to cooking. The larger of the two (the "medium" one) is large enough to beat an egg with a whisk.
While six of each is enough for me, they do get continual use in my kitchen. Yes, they seem a bit pricey but you get what you pay for. These are a high quality product.
Oh yeah, the "extra large" bowl that is presently sold out is also a good product. Everyone should grab one of these the next time they come around.