The system helps you build out a spec first, then uses a few subagents which are tuned for placing files, reviewing for best practice, etc.
I've been using it for about a week and about 70% of my Claude Code usage runs through /feature right now.
The nice thing is you can give it a _lot_ of requests and let it run for 10-15 minutes without interruption. Plus, it makes a set of planning documents before it implements, so you can see exactly what it thought it was changing.