Chaps installed an Aprilaire humidifier in our home. The two installers were fast (<1 hr; we have easy access to our furnace), respectful, and courteous. They took their shoes off when they entered our house without us having to ask. They explained the installation and demonstrated operation of the humidifier so that we understood. The installation looks very neat, solid, and professional.
As for the Aprilaire humidifier, time will tell, but it appears well-designed and solidly built, and best of all, it integrates beautifully with our Aprilaire thermostat.