I found another review that had a smidge of technical data in it. In it the author states that he was able to copy a GB of data to the My Book World in 4 minutes and 46 seconds. Let me scratch out some math here... (if you see an error, please point it out!)
(4*60)+46 = 286 seconds
Assuming a GB = 1024MB
1024/286 = 3.6MB/sec
3.6MB/sec ~ 36Mbits/sec
Hmmm that is the same number I am seeing. I would not bother upgrading anything to GB for this device. It only uses 1/3rd of a 100MB pipe.