I was looking at the comparisons they have and the relay switch seems to be a great bargain. If you are not using a lot of scenes, aside from a slightly lower load, there is not much difference.
On the dimmer there is much more (the light bars, ramp rates, etc).
Given that, I may just consider using them in the garage and some other spots that might have been a lower priority. Seems like a smart move, gives them a high end and a 'low-end' product.
Oh, and I noticed the usb controller is being released (with software).