I'm a solo founder. I fed it a fairly large "context doc" for the core technology of my company, current state of things, and the business strategy, mostly generated with the help of Claude 4, and asked it what it thought. It came back with a massive list of detailed ambiguities and inconsistencies -- very direct and detailed. The only praise was the first sentence of the feedback: "The core idea is sound and well-differentiated."

It's got quite a different feel so far.