I have 2 of the samsung F4 eco drives but they was made in Feb 2011 so no need to update.
Another thing to look out for is how many Thumbs.db files are on the NAS. I deleted all mine.
Well i bought one for my main PC mine 3 days ago and it required an update....
just flash with the fimrware patch and bobs ya uncle speeds are back up to normal... 37 meg to the Nas and summin silly like 60meg copying from the Nas to my PC.