Ask HN: webmetrics/pingdom alternative for global response times?

I'm looking for a BETTER self-serve version of webmetrics.com -- kind of like a global pingdom for response times.

I'd like to know what my response times and transfer times are for my website throughout the world. Like a pingdom that runs end-to-end load testing every 5 minutes in 10 or 20 more locations all day.

Webmetrics does this, but I am pretty dissatisfied with the information design and interaction design.