I've bought three of them...my take....
With extended battery:
Body Glove>Seidio Surface>Verizon/Moto Glossy Silicon
Without extended battery:
Verizon/Moto Glossy Silicon>Body Glove>Seidio Surface
My rationale. All three fit the extended battery though the glossy silicon becomes distorted, bowing the sides out and contorting the opening to the power/HDMI jack. But it a nice slim case with the right amount of tackiness to slide in and out of the pocket without the extended battery.
The Seidio is hampered by an upper and lower lip that impedes your access to both the notify window and bottom buttons. But, it fits the extended battery better than the glossy silicon.
The body glove is designed better than the Seidio as there is no impedence of the buttons/notify window. And it fits the extended battery case well. I grade it only slightly below the glossy silicon on the regular battery because it is a bit more bulky. I used the body glove with the Droid 1 and was satisfied with it except for the fact that it was hard to remove for a battery pull. Otherwise I would have bought this right away (instead of it being the third case I bought). However, this one seems to come off much easier.
BTW, you can get both the glossy silicon and body glove at a Verizon store. The Seidio you have to order. It's overrated IMO as it is ergonomically challenged and it is the slickest (read: least tacky) of all three.
One more BTW, this thread belongs in the accessories sub forum....there is plenty of discussion of cases there.