I have the dock but not the OtterBox. Due to the shape of the dock I don't think you can fit a case on it.

 

I have the Motorola dock, it works with the case I have, but those otterboxes are bigger from what I have seen. It comes with a spacer that allows it to fit with no case at all, or remove it to fit with the case.
I use it to listen to Pandora at work with a wired connection to my bookshelf radio. It's nice to have a fully charged phone at the end of the workday...while using it too.

 

I have the dock for my MAXX and highly recommend it. As I look at it right now, there is a plate to take up the extra room that a RAZR has. It should work for you. They normally go for 40 bucks but got mine for 18 NIB on ebay.

 

Mine fits fine with the Cruzer Lite case. I haven't had the Commuter (although have one on my son's Nexus) to say for sure, but I'm guessing the back is too thick for it to fit on the Motorola dock. I got my docks at Verizon on clearance a few weeks ago for $15 (although that was with 25% discount).