I think some modules are far more important to know about than this one. Seems to me that it's more about marketing their startup (last 2 modules you should know about was from his cofounder with a paragraph on testling). Don't get me wrong, I agree that these are useful libraries but there are others that are definitively worth knowing about even though they aren't related to browserling. </end of me being grumpy>
This module pales in comparison to the previous module write up of Dnode. Sure this is helpful, but not exactly something everyone must know of. I find optimist and Dnode (actually a lot of SubStacks modules) to be more noteworthy. One thing I will say is at least this utility module is well documented.