I have the dock for the 9930 and it works great. Only trick is you have to make sure the phone is straight. If it's leaning left/right too much the charge terminals won't make proper contact.
yeah me too I just got my 9930 the other day.. i dont even know why i got the cradle. I think that VZW was offering a discount if i bought some accessories. It does work, but i hate having to remove the rubber condom every time i charge it. I think i'll just use the USB. I'll bet it makes better connection anyhow.