Our biggest challenge in building this tool was compatibility. Every webpage is different and even seemingly innocuous things things like frame busters and javascript redirects presented quite a challenge for us. We were fortunate to have a great set of early beta customers that gave us feedback when things didn't work and we took it one website at a time.

We'd love to share the lessons we learned along the way with the HN community in a blog post. Let me know what you're most interested in and we'll share what we've learned.