You get the MM Dock, 110V charger, and a proper USB cable all in one. that gives you lots of options, not bad for $24 delivered. Since Verizon charges the same price for the Droid wall charger(without detachable USB cable) as the MM Dock, it is a no-brainer.
The only thing I would like to see from Moto/Verizon is an OEM Car charger that also has the removable USB cable. That makes the whole system very flexible and you always have a USB cable when needed. I know there are lots of "aftermarket" car chargers that use the detatchable USB cable, but I would want one from a reputable company that will stand behind the fact it is a proper charger for the Droid. An Ebay add that says it is compatible is not good enough for me.