what exactly is this, i know apexi makes them and they look cool, but does it actually improve performance? Based on my mods below would it help me gain significant power? Do i have to know alot to use it?

Nos Fogger Kit,AemCAI, TopFuel UDP, pacesetter cat-back, ARD bored 57mm t.b., P&P intake mani, Ractive front/rear strut bars,rear tie bar,eibach sportlines,tokico blues, morosso wires, ngkIX plugs, konig subzeros,proj. heads,gunmetal tails, rev.indiglow gauges,reverse light mod

from what i've read and seen, it tends to add 8-10 hp to the wheels on our cars. granted, this is done by a professional who can dyno tune your car. i plan on having this done once i get my new o2 sensor.
later

2GNT #1865
2006 Yamaha YZF R6 (Blue/Black)
2005 Honda CBR 600 RR (Blue REPSOL)
2003 BMW 325I Premium/Sport Package
2003 Honda CBR 600 RR (sold)
1998 Mitsubishi Eclipse RS (sold)
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DarkOne> but we all have that inner ricer that is just dying to come out sometimes...

All the S-AFC is, is a piggyback computer for your fuel system. All it does is modifies the air-flow signal to give you optimal Air/fuel ratio. Its not going to be somthing that you plug in and add horsepower. Yes it does look cool but witht hte list of your mods I wouldnt see you spending the 350 on it. You wouldnt really have a reason till you go turbo or nitrous to need to be adjusting fuel levels IMO.