Normally our girl's painting sessions are a complicated affair involving squidgy bottles of poster paint and inexplicable quantities of water. In an effort to reduce the colateral damage to our furniture, I decided to invest in this set of watercolours.
Instant success! Now, if she wants to paint, it no longer takes 10 minutes to set up the aforementioned paraphernalia. We just open the lid, and get a small jar of rinsing water. She also likes it because there are instantly more colours available, and they are easier to mix. Ok, the colours aren't as intense as her poster paints. However, she still produces nice pictures.
The bottom line is that with a kit like this, it is easier for your kids to paint, and less messy for you as a parent.
Can't be bad.