Microphone Madness is a company that was formed by a former Sound Professionals employee. $250 is a great deal for a pair of MKE40's or MKE2's, but that is about all I can say for MM. The SP-PREAMP was designed by Dick Campbell, I doubt the MM preamp is as good of a design. But who knows....
The Church 9100 preamp is sonically fantastic, on par with many name brand preamps...
my $0.02