FiTech EFI system

So after you've shielded the pick up wires etc, how has everyone's self learning gone? Any issues? I only put about five miles on mine and it ran good but didn't bang in like a 4bl....yet? It also pops on decal, seemed like fuel in the exhaust.
I`m reading all this w/ interest, I`ve had none of the problems mentioned here w/ my fast.2.0, in case someone hasn`t made their mind up about which one to buy. no bad mouthing intended.