Sensei got it right on. The actual mechanical quality of the FMU is certainly good, but it's far from the most precise method of adding fuel to match boost.

If you don't want to spend the money for a Hondata you can go the DIY route and use Uberdata. It does require some skills with modifying a circuit board but it's not overly challenging.

To go with that you can get a set of 450 cc/min injectors from a turbo DSM, the injector resistor box from an '88-'91 fuel injected Honda, and a Holley 12-916 fuel pump (Walbro 255 lph is a repackaged version of this) and be set.

In the end you probably won't spend any more on the supplies to convert your ECU and the injectors, than you would on the FMU and Missing Link.