I haven't tried Bob's Red Mill, but Whole Foods has a store brand gf sandwich bread mix that is excellent. Much better than the first bread mix I tried. (Pamela's, I think.) They also have a tasty gf corn bread mix, but that can cause me problems sometimes. I don't think I digest the corn meal very well.
In my opinion, it is totally worth it to bake my own gf bread. My Whole Foods sells frozen gf bread for $6.99 a loaf. $6.99! For bread! I've never tried it, but there's no way it's tastier than the loaf I just pulled out of my bread machine. And the mix is a lot cheaper than $6.99 a box. It would probably be even less expensive to make my bread from scratch, but I'm not quite there yet. I don't have a lot of baking experience, and all of that is with the assistance of a bread machine. With cooking I don't mind throwing stuff together to see what I get. But baking is all about chemistry. If you don't do it right you'll end up with a mess.
I heard recently that the whey (liquid yellowish stuff) drained off of homemade yogurt is very useful in gf baking. Gluten is a protein, and whey is protein, so I guess it helps to add structure that the gf flours lack. Does anyone know anything about this or have suggestions on where I should look for more info?