I just tried FIM about two weeks ago, and like the results. I'm finding the timing to be a little tricky if you want to keep all 4 new shoots at about the same level, but it's easy to top the taller ones if you have to, and end up with even more mains. Sweet. The only downfall, is that FIM'ing takes longer to recover than it does when you top them, but in the end it takes about the same time because you need to top twice to get the same results as FIM.
I'm still a noob to supercropping. I tried it once so far, on a Crystal plant, and it didn't react too well. Maybe i should of tied the top down after i supercropped it, because it kept trying to stand up(over a few days time), while the lower branches never shot up fast enough to meet the top of the canopy. I haven't given up though, and will have it perfected, if it's the last thing i do.LOL