I do like it a lot. I don't have any expectations that I'm increasing my chain life by 25% or anything like that, but:
1. It's fast and easy
2. It's messy but not as messy as other methods of cleaning.
3. It does a good job of getting the grime off and prepping for re-lube.

That dummy hub really helps too... I use it for this and for a spacer in my bike airline bag.