Get the regular Freeagent Go, because it will be formatted (Fat32) so your PC can read/write to it, and also should be read/writeable by your Mac. Then, copy all the data from your PC you want to transfer to your external Freeagent Go. After it's copied, then connect/copy it to your Mac HD in your MBP (I did this, just created a folder called Archived files from Windows.)
Once you have copied all the files on the external drive to your Mac HD, reformat the Freeagent Go, unless you intend to use it with both your PC and your Mac. If so, then don't reformat it or you won't be able to use it with your PC.
Use Disk Utility on your MBP. Select the Freeagent drive, and click the "erase" tab. Select Mac OS extended (journaled) in the drop down list - it should probably be the default... then click "erase." It should be formatted in a few seconds. If you click "erase free space" it might take quite a while before it's done, and probably isn't necessary.