I'm currently running a SaaS on Cloudflare Workers + Pages. The developer experience is genuinely good, deploying serverless functions and static sites from the same repo has been seamless.
But I hit a real issue recently: CDN edge caching served stale HTML after a deploy, and the service worker cached the bad response. Took a CDN purge from the dashboard to fix. The debugging experience when things go wrong at the edge is painful, you're always guessing which cache layer is the problem.
That being said, the free tier is hard to beat for getting started. Workers, Pages, KV, R2 — you can run a full production app at near-zero cost until you hit scale. Not sure if Bunny offers that.