Hi,
If you're considering "Current USA Fission Nano-Skimmer", then maybe Resun SK-05 should be in your list too. Below is my simple review of it:
http://www.sgreefclub.com/forum/index.php?showtopic=64909
IMHO, we probably need to equate their performance with price, local availability, and % real estate they take up in our main display tank. Every reefer has a slightly different scale for this, thus resulting in different purchase decision.
Happy skimming . . .