In interest of full disclosure I now work for Rollbar, but the reason I looked for a job from them was because of the amazing customer service I received as a client. All the responses I got were quick, positive, and accurate. I figured if they treated each other half as well as they treated their customers it'd be a pretty decent place to work.

At my previous employer we used Rollbar to catch and debug production errors so we could fix them and report them to our customers before the customers even had a chance to report them to us. That level of customer service is only enabled when you have top notch customer error logging like Rollbar provides. I don't just say it because I work here, I say it because it's true.