I think now that BEGi has come out with a pretty inexpensive FMIC kit, its worth just getting that instead of a SMIC. Before, the cheapest kit was HiBoost I believe, for approx $850 shipped. a SMIC will run for approx $500-$600, and for those who are looking for mild as opposed to wild in the modding dept, a SMIC will yield gains comparable to a FMIC kit at low boost (9psi or lower) with a turboback exhaust and intake as well. However, if you're planning on going wild with a disco potato and bigger injectors, high boost, etc, then a FMIC is necessary.
In my case, I wasn't planning on going wild, so I was going to purchase a SMIC for the easy mod and power increase. But, my aspirations got a bit higher and I'm going to upgrade to a full 3" turboback exhaust and Perrin FMIC so I can handle 15psi after I get an MPI tuner as well. So it all depends on what your final goal is, and your budget. No one should discredit a SMIC, because it has been shown to have big gains, and people's testimonials have only backed that up. So I say, if you want a SMIC, get a SMIC, its your car, so do whatever makes you happy.