I have actually used one of them and it doesn't take long to get the hang of it. When our neighbor's cat was run over last summer, I borrowed one from the construction guys down the street and dug a grave in front of our house with it. Well, I got the hole partially dug before the neighbor's guy insisted on taking the shovel/hoe from me and finishing the job.
The pick was for the asphalt, but the rest of the hoeing and shoveling is done with the "tool".
As a hoe or broad pick ... I have no idea how long my back would last doing the job the same way this young man is doing it. Yes I do, about 10 minutes. I guess my neighbor's help did me a big favor.
As a shovel ...