Does anyone have any experience/advice with automated patient reminder call systems?

I’m thinking about using an automated patient reminder call system for our small surgical practice. Doing manual reminder calls is a pretty time-consuming task for the staff. Do you have any experience with them, are there things to watch out for that may not be immediately obvious? Are there systems you’ve used and love… or hate? Why?

I’ve Googled a bit and there seem to be MANY options out there, all SEOed to hell and back, which makes it difficult to do an objective comparison of what’s out there.

Thanks so much in advance for sharing your experience.