Product review (5 stars): Saved over $500 doing it myself
Perfect fit, easy to install, and though I didn't expect it for a week, it arrived the next-next day (no kidding!).
There's only 1 difference I found, and that's the clicking. My original timer sounded more like when riding a bike with a card between the spokes, whereas this one has larger spaces between the clicks. But they all match with the lines on the face, and the dryer works great, so no complaints from me.
I also found  a video online that tells exactly how to do it, too (which is actually how I was planning on doing it, so it just confirmed my planned strategy). If you've ever changed the spark plugs on your car, it's like that - take one off the old one, place it on the new one that matches, and keep doing that until they're all off the old one and all on the new one.
Think about it: I could've paid $500-1200 for a new dryer, or paid a guy to come out and fix it for a couple hundred, or pay just over $50 for the part and install it myself. I went with the cheaper option, and it was so easy to do.