Jury's still out on this one... *UPDATED*
First, even though the Amazon listing claims that the correct template is included in the box, it is NOT.<br /><br />Installation other than that was simple enough with the correct hole saw.  Unit powered on with no problem and initially there were no concerns.  After it had been running a while, every time the fan started on the air conditioner, there was a funky smell.  It is a cross between hot electronics and something burning.  I checked the unit and nothing is overly warm, even when sitting in an attic in Louisiana.  I ended up turning the unit off for the rest of the night, but even then there was still an odor for a while.<br /><br />Going to contact the manufacturer and see what they say.<br /><br />UPDATE 1/22/2022: Went up to the attic today to store some stuff and unit is dead.  Zero UV.  Power switch lights up.  Pulled unit off of duct and checked lamps to be sure they were seated correctly.  Checked fuse anyway.  Swapped lamps between sockets.  Zero. Zip.  Zilch.  Nada.  Amazon shows unavailable, so guess I’m screwed.
Rating: 1 stars