Product review (5 stars): Frost buildup? Check your timer first.
This thing saved me having to buy a new freezer.

I had an inch of frost on my upright freezer and thought that I was going to have to buy a new unit because it couldn't hold a low temperature. Since it was soon-too-be trash anyway, I watched a few YouTube videos and decided to take a stab at fixing my freezer.

First, I left it unplugged and defrosted it. Then, I unscrewed all of the obvious panels and got out a volt meter for some testing. When I plugged in, nothing on the defroster was hot, which had me suspicious, but I had never done this before so I took a screwdriver and advanced the factory timer a few notches and re-tested for a few spins. Dead.

I then took out the timer and tested a pass-through current. Hot.

Okay, I just need a new timer. I ordered this one, got in in two days, plugged it in, secured it, and now have a working freezer for about 10% of the cost of a new one.

Test first and make sure you need the thing. If you do, this unit will be fine as long as the freezer model numbers match.