I started using it this weekend to build a greenfield project from scratch. Vibe requests ran out very quickly, so I just opened up VS Code in another window and had Copilot's Agent handle those. I just use Kiro for the Spec requests at the moment, which it does quite well. I think its a great tool, but if someone can copy what they're doing into Copilot, then I'll go back to using Copilot exclusively.
The pricing really turned me off after a fantastic initial experience.