Interesting containers, although for $40 a bit pricey.

At my office we hire an agency to maintain office plants. What they do is just use a pot with no drainage holes in it and then set a smaller pot with drainage holes inside it.

The pot with the plant is supported in the drainless pot a couple inches off the bottom with some plus sign shaped hard, but spongey material. The drainless pot is filled with water up to the level of the inside container and a wick material (no idea what it is made of) is running out the drainage hole of the interior pot and down into the water.

With a little creativity a very similar setup could be made from a wide range of materials.

As far as 'smart' systems that let the medium dry out I have never heard of such a thing. If it is a self watering container all variations I have seen keep the mix evenly moist (approximately) until the reservoir water runs dry.

I am sure the unit you are looking at would do a nice job assuming your aren't put off by the $40 each price tag.

kcgardener, I just read your wants to water your plants, you did no say whether veg, garden or house plants. I have the same watering problem and have a planter with a tomato in it now for 2 months with blooms on it and it was watered when planted and once a month later. My planter is 5 gal, and I am making them for veg, garden only,