I tested FX-37 extensively a couple years ago and found that although it did result in negatives that appeared sharper, it did so at the cost of degraded tonality: transition between softly contrasting areas was rendered far more harshly with an aggressive, unpleasant look. Because of this I abandoned FX-37, since I value the preservation of the impression of tactile light.
YMMV, of course. For many, I'm sure the enhanced sharpness look will be the cat's meow.