First, I have to say the the turnaround on the order was ridiculously fast. I placed the order via live chat one afternoon, and FedEx dropped it at my door about noon the next day!
The icemaker was an exact replacement. Following the instructions, removal of the old one was simple, and installation of the new one was just as simple. The hardest part was bending the power cable to get the connectors to line up exactly right. I powered it up, and within a few hours I was getting ice again.
The defrost timer: I'd already watched your tutorial video on it, and the swap was a snap. It took no more than 5 minutes. It probably took about as long to empty and refill the top shelf as it did to do the swap.