Max:
Just last weekend I did some comparisons of outlets. All I can say is if you are going to upgrade, go ahead and find a deal on the Wattgate. It is phenomenal. I compared it directly to the FIM in the most scientific, and fair way possible. I found the FIM to be less musical, and not as quiet as the Wattgate. The Wattgate really helps with the extra silence around the notes, and sweetens the highs so that they sound richer, and more natural.
The FIM was etched in comparison.
HTH,
B