I've heard of it, but haven't had a chance to actually try it out. The concept does seem reasonable on the surface though. I think an interactive feedback loop is really critical for this sort of stuff, where the user can ask the agent to build a feature, then can try it out and see that it does what they need, and iterate on that.

A lot of the apps people need are very simple in nature, there tends to be some input form, to collect data, and then some visualization to display data, and talking to some endpoints to send out emails or whatever. It doesn't need to be beautiful or hyper efficient, just needs to work well enough to solve a problem a particular person has. Currently, unless you're a dev you'd have to pay tens of thousands of dollars for somebody to build even a simple app for you. This kind of stuff has the potential to lower that barrier dramatically.