While in Modular Madness West today, I asked them about what they thought about blow-thru setups.
They prefer them for the same reasons Turbo Tom pointed out. They also like using MAFia's with the stock MAF. Though, the cream of the crop OEM MAF's at this point in their opinion is the '05+ Mustang GT MAF.
He admitted that most kits they tune are the procharger type that are designed to run with the blow-thru. He noted that draw-thru are as good, but need more time to dial them in.
I noted the 900rwhp '04 Terminator 5L cammer with the blow-thru TT setup they're building now