I looked at quite a few self watering pots before buying these and I'm really pleased with the purchase.
The pots themselves are sturdy but I was a bit worried that the cages would be flimsy. However, they aren't. Each level is solid even the top tier.
You can build them up as high as you need. In the first instance, we just put the first tier on but have now added the second to the pots with tomatoes.
At the moment, we're still having to add water everyday to the pots but only once per day even in the hot weather we've had recently.
And, if you do buy them, don't panic when they arrive that the cages are missing. They are all tucked securely into the bottom of each pot - something I missed on first opening the pack!