Product review (5 stars): Fixed my fridge for ~1% the cost of a new one... What's not to like?
Seller couldn't confirm that it would work in my Admiral HRG 62186, but other internet forums suggested it would, and it did.

If your freezer evaporator is completely iced over (as mine was), you can thaw it manually (with a hair dryer or similar), troubleshoot to see which of the three likely parts is bad, and order it. Your fridge/freezer will likely work for about another week or so while the part comes in. (After 8 days, mine was moderately iced over, but still holding temperature.)

Replacement times quoted in youtube videos were "20 minutes". Not 20 Earth minutes... :) Including thawing the frozer evap, I was right around 90 minutes from picking up a tool to putting everything away. Thawing was probably half of the total time. Several good youtube videos can show you how to troubleshoot, and probably how to change the heater as well, but that part was pretty straightforward.

Nothing was difficult in any way. Just a dozen or so screws and some fiddling around some very sharp sheet metal parts. $16 and a couple hours total sure beats buying a whole new fridge!