My experience is that it gets you 80-90% of the way at 20x the speed, but coaxing it into fixing the remaining 10-20% happens at a staggeringly slow speed.

All programming is like this to some extent, but Claude's 80/20 behavior is so much more extreme. It can almost build anything in 15-30 minutes, but after those 15-30 minutes are up, it's only "almost built". Then you need to spend hours, days, maybe even weeks getting past the "almost".

Big part of why everyone seems to be vibe coding apps, but almost nobody seems to be shipping anything.