They are comfortable because they don't rub too much, being mostly canvas, but they also don't provide much support. I don't recommend for lots of walking or standing on your feet all day. For shorter intervals, though, they're great.
One time I wore these shoes to Disneyland all day and my feet were killing me. So if you're going to be doing A LOT of walking all day long, or maybe going hiking or jogging, I would say to pass on these and wear a more comfortable shoes with more support.
At first they are not too comfortable but after you wear them for a while you get used to them. I don't recommend them for when you are walking around a lot. Since these are flat shoes your feet will start to hurt after a while.
Hands down the most comfortable shoe I own. I have been wearing them my whole life. That being said, if your foot requires a lot of support, these probably won't be the right show for you. There's not much arch support.