Mmmm, have used similar but filling them everyday is as much of a chore as just getting the cans out. A permenent irigation set-up would be my ideal goal...if only I didn't have too too many pots which are moved all over the garden on a weekly (daily) basis. I have gotten as far as laying out the initial piping and timers then ground to a confused halt.

If I was going away for a weekend, I have set up emergency capillary systems with buckets and wicks...but it looks unsightly and has limited utility.

I've had a couple of them. They were more pretty than useful for me. Alage can build up in them, and I didn't feel like the fuss of cleaning them out. Switched over to ollas. I use jugs that are either fully or partially buried, depending on if they have a glazed top or not. But the concept is similar to that of the terra cotta watering spike in the pic. The terra cotta is below the soil line and moisture slowly eeks out. I've not used a watering spike like that.

With hanging baskets, I've had better luck with self watering ones.