I have used cowpots to start peppers and tomatoes for my own garden for years but decided to try these due to the lower cost. Cowpots will look awful on the outside as the starter plants grow with lots of mold and other stuff growing on the surface. However, the roots penetrate easily and you will see them poking through the pot here and there. My plants have done great when the cowpot was planted directly in the soil/earthbox without alteration.
With these pots the roots did not penetrate and I saw very little change to the outside of the pots, wet or dry. I did not have any mold issues so they looked nice. When I planted I removed most of the pots (cut them off)and could see the roots were circling. I planted a few side by side trials where I removed the pot and vertical cut the circling roots on one next to one where I left the pot and planted the whole thing. The plants where I removed the pots got a quicker start and generally did better all season.
If you want a lowish cost but biodegradable replacement for plastic starter pots these would be excellent. If you are selling starter plants these would probably look nicer and hold up better than cowpots. They seem to work fine if they are treated like plastic pots and removed for planting. It is unlikely they can be reused, I just buried the pieces in the planting hole or dumped them on the surface nearby.
However, if you want to plant directly in the soil in the pot I can't recommend these based on my experience. Now I have to figure out if I want to make a lifetime commitment to using my huge case of these pots or fork out another pile of money for more cowpots!