After migrating three projects off Auth0, spending 47 hours debugging NextAuth session issues, and implementing Clerk across 14 tenant applications, I can say this: Clerk is the first auth provider that made me forget I was doing authentication. I've been implementing authentication professionally for 12 years — from hand-rolled bcrypt + JWT to Firebase Auth, Auth0, NextAuth, and Supabase Auth. Every one of them made me miserable in different ways. Auth0's dashboard was Byzantine. NextAuth's session management felt like a Rube Goldberg machine. Supabase Auth worked until you needed custom claims, at which point it became a database migration project. I migrated my first project to Clerk in August 2025 — a Next.js SaaS application with 4,200 users, social login (Google/GitHub), and organization-based multi-tenancy. The migration took 11 hours including testing. I've since migrated two more projects and built three greenfield applications on Clerk.…