Product review (5 stars): Worth it.
It's not a genuine Sub-Zero part. The online parts houses say that Sub-Zero policy won't let them sell parts to customers. Only authorized repair shops can get the parts. I assume that means they won't sell you the part but will install this fan for you for $350 or so.  My authorized Sub-Zero repair shop has an automatic $120 trip charge for any visit. Incredibly anti-consumer policy and an argument against the free market.

It works. It's not an exact replacement. The spindle where the fan attached was different than the OEM part for my Sub-Zero Model 632. But they included a rubber isolater that fit in their included bag of misc parts. I received everything in the picture.

It is louder but I'm not surprised because of warnings from other reviewers. It's louder because it's spinning faster. The small increase in loudness doesn't bother me.  Especially since I saved $300 and can tell Sub-Zero to f!&! o!@  I assume the increased fan speed is better?

If you're at all reasonably handy, it's easy to install. I needed a stubby screwdriver which I have to reach the far mounting screw which was the only pain in the process. You have to insert the correct wires into the appropriate connector. You just make it look exactly like the original.

Definitely worth it.