Quote Originally Posted by irydyum
FIM has the capability of producing multiple tops with one cut. Traditional topping usually results in the 2 nodes just under the cut becoming tops.

A week or so after the FIM you may notice 5 or 6 branches competing to be the main top where with traditional it's usually just 2 tops.

That is the difference as far as my experience has shown, I would be interested to hear others experience with it.
As an experiment I fimmed (I never know how to conjugate made up words) 2 of my current grow, and each ended up with 4 main tops. Ironically though, it seems as if they are quite a bit smaller than the main colas on the plants that were not cut. How it all adds up in terms of weight I don't know. The plant that actually looks to have the most bud weight so far is actually one that developed (on its own, apparently) 2 main stems early on in veg. They stayed the same height and now both main stems have buds as big as the main cola on plants with only one. Weird.