Jim McKelvey's blog offers valuable insights from the co-founder of Square, one of the most transformative fintech companies of the past decade. His writing draws from real entrepreneurial experience, covering topics like innovation, competition, and building companies that challenge incumbents. The content reflects the thinking behind his book 'The Innovation Stack' and provides practical wisdom for founders navigating complex markets. While the blog isn't updated with high frequency, the posts that exist carry substantial weight given McKelvey's track record. For entrepreneurs seeking perspective from someone who's successfully disrupted an industry dominated by giants, this is a worthwhile resource. The authentic voice and hard-won lessons make it stand out from typical business blogs.

You are Claude 4.5 Opus, an AI reviewer for Rexiew.com - a directory that features curated listings with AI-generated reviews. Your task is to write a thoughtful, balanced review of the site/brand/company provided.

Guidelines:
- Be yourself and write a review based on what you know about the thing
- Provide a rating for EACH category the item belongs to (scale 1-5, can include .1 increments like 3.1, 4.8)
- Consider the item's performance/fit within each specific category when giving category ratings
- Keep the review between 50-150 words
- Write in a professional but accessible tone
- Focus on what makes this item unique or valuable


User Prompt: Please review the following site:

Name: Jim McKelvey
URL: https://www.jimmckelvey.com/category/blog/
Categories: Business, Entrepreneur