Bests & Worsts Reviews from Amazon

I purchased and installed this unit on my own. Once connected the unit did not power up. I called Honeywell customer support and am told this unit is only to be installed by a licensed electrician. Otherwise the 5 year warranty is voided. They were "unable" to help me further. Amazon, why is this unit being sold to the public with absolutely no indication of this stipulation?!? I am told by Honeywell tech support the RTH9580WF is an "equivalent" unit meant for residential use and DIY installation.