What do you guys think of Rookout?

I recently found a new service called Rookout, which helps with debugging production applications.

Basically, you can view the source code from your browser and add "non-breaking breakpoints", which get triggered whenever the application runs that line of code. It doesn't stop it like regular debuggers, but it does give you all that context - like the values of local variables.

I've found it extremely helpful, because I used to have to keep redeploying with print statements to debug, but now I can just add a breakpoint in Rookout without redeploying at all.

Have any of you tried it, and if so what do you think about it?