Cow Pots have a lot of very appealing features. They were designed by diary farmers who wanted to do something constructive with their excess manure and reduce the pollution created by their dairy. Manure is a renewable resource and fully biodegradable, unlike plastic, which takes petroleum to produce and doesn't break down in landfills. Plus, you can put your Cow Pots directly in the ground once your seedling is ready to be planted. That eliminates the possibility of damaging your seedlings during transplant.
I ordered two 12-packs of 4 inch pots and planted some tomato, pepper and eggplant seeds last weekend. The pots were sturdy and dry and didn't have any noticeable odor.
One thing I have to keep in mind is that this kind of pot tends to dry out more quickly than a plastic pot, especially in the dry Southern California air. So, my Cow Pots will need to be watered more frequently.
Cow Pots also promise to help grow healthier, studier seedlings, because of the fertilizing aspects of the pot. I'll have to let you know if that claim turns out to be true.