RAZR V3xx--Largest micro card??

For my new RAZR V3xx I want to buy the largest Micro SD card that will work.
On their site, Motorola states it can use the 2 GB Sandisk Micro card--the largest currently available.
Apparently that is dated because now Sandisk offers 4 GB and 8 GB Micro SD cards. If they will work, I want to buy the larger card. Has anyone tried a 4 or 8 GB micro? Any luck?
Thanks. Paul.

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Followup.
Moderator--I just realized this would be better on the RAZR sub-forum. Will you move this thread or should I re-post?
Thanks. Paul.