I called MasterCraft after seeing them on Yelp and I'm so glad I did. We just bought a house and the guy wanted an opener unit on our 3rd garage door. They were able to get me an appointment for Saturday (I called on a Thursday afternoon), and Jonathan actually was able to come early because someone else cancelled (their loss!). He called first to find out if it was ok to come by early. When he arrived he was patient and waited for my fiance to come back from an errand he was running (since he was the decision maker on the garage situation anyway).
He recommended that we replace the two exiting units as they're from about 1999, but we decided to hold off a bit because we just moved in, but it's a definite possibility that we will in the near future. Jonathan tuned up the existing openers and explained why the clicker we bought wouldn't work with the existing units (or the new one, it turns out). We will definitely call MasterCraft back when we're ready to replace the other two units.