The good: This Nikon knock off works the way it's supposed to.
The bad: The sample I ended up with had a plug that barely fit the socket on my D90 and ended up damaged.
The details: When I first tried this timer, it wouldn't work. Wondering if it was making good contact I pushed it into the socket a little harder ("should it really go in this tightly?", I wondered) and was rewarded with a functioning remote. When I removed it, however, the outer metal shield on the plug remained jammed in the socket on the camera while the body of the plug came free. Luckily, the jammed part came out with a pair of pliers. To his credit, the seller offered a return, but the shipping was for half the cost of the remote so I opted to hold on it it. The plug, without the outer jacket, is a little loose in the socket and care must be taken not to damage the connector inside the socket but it works just fine. For the amount of use it will get, I will live with it.
I shouldn't be surprised that a cheap knock-off doesn't have the same level of quality control as the genuine article.