Product review (2 stars): Read the review
It was a direct replacement for the OEM. Zero issues swapping it out.

A few days after the installation with the refrigerator running fine to that point, the refigerator then started running warm in the refrigerator section but cold in the freezer. A little research and frozen evaporator coils due to a defrost issue was a likely cause.  I had marked the shaft of the timer and verified rotation after installation indicating the defrost timer clock was working.. but not any more. I didn't get to the root cause instantly as the part was new, I had verified it after installation and the previous one lasted 29 years.

I manually rotated the shaft with a screw driver and put it into defrost cycle. You can tell because the compressor and the fan stop when you hit that point on the clock and they had been running steadily for 2 days (because the refrigerator section never reached temperature, due to the now block of ice evaporator coils).

After manually timing the defrost cycle to thaw the frozen coils (yielding a good quart of water in the drip pan) I killed power and uninstalled the new unit intending to put the old suspect one back when I found the problem. While the new unit is very similar to and identical in mounting to the OEM there is one difference. In the OEM version the power for the timer is hard wired in, in the Supco there are two thin spade lugs that straddle the robust terminals for power connector. They are very light weight as minimal power is required to run the defrost timer clock but one of them had broken where the thin body of the spade meets the part of the spade that is crimped on to the wire.

Did I bump it during installation, maybe but the bend in the wires and lugs between the broken and unbroken sides appeared identical save for the 1/16" air gap between the pieces of the broken spade. It is more likely it was stressed during during manufacture when the spade was pushed into place or during packaging.

Since the original is suspect I soldered the pieces of the spade together and for good measure added a dollop of solder on the still good connector to reinforce it at the weak spot and now the timer rotates again.

Originally swapping this Supco part for the OEM was a very easy change out but since I had to repair it after a couple of days of running, it only gets 2 stars. I suspect getting connector(s) that were stressed is just my bad luck but it illustrates how light weight the spades connectors are. No human hands touched it after installation so the failure had to be vibration induced (beyond the initial stress).

I would buy the unit again but I also would take the preventative measure of adding a touch of solder at the weak spot as described and who doesn't like a part they feel compelled to strengthen before putting it into service for it's designed use?  Were is not for the paper thin spade lugs, this would get 5 stars. I have written Supco customer service expecting nothing other than hoping for future product improvement.