We use CallFire Voice Broadcasts for our accounts receivable departments across 5 of our North American brands. This has allowed us to prioritize the most important part of our collections team workflow, speaking with customers directly without having to manually make calls.
The services are easy to use and robust, but there is room for improvement. Unfortunately, not much has changed over the last 2 years of use. There haven't been any new features or innovations in that time.
API integration and automation is not easy for most folks to jump into and there is very little technical support or documentation to take advantage of such features.
The standard reports are generally sufficient, but there isn't any customization or intelligence available.
CallFire is perfect if you need a simple, cost-effective solution to broadcast voice or SMS messages with almost no setup. As I mentioned before, it is dead simple to create and run campaigns. That said, as soon as you want to be a bit more dynamic, it's going to take a lot of trial and error. Depending on the complexity of your needs, I might recommend shopping around with a different vendor.