Using momentum seems to go with larger muscle development, with due respect to what Yates said. To get that heavier weight jump started, from a weaker stretched out (biceps) position, body English will be required. If trying for ultra strict performance throughout the pull, you are only limiting the weight used for the back and letting the arms get the blunt of the work. Like doing a 250 BB row vs a 135lb row. Which version will give you a better back?
Cheating can have an important place when doing any exercise and could be called the next step above momentum. This is controlled cheating, with a style and rhythm to a rep. But not only the last few reps, but for the total set. This is not to be confused with sloppy form, where the weight is yanked, jerked, half repped or whatever. You are using a heavier but with control. There is a video of Bertil Fox doing cheat curls somewhere on this site. Not perfect but still a pretty good example of how cheats are preformed.
BB'ing is like a personal lab experiment to see what may or may not work for you and you only. I do think that BB'ers are among the most inventive group around, with regards to their subculture. But, at times, they can get into a rut with what the "experts" say is the correct way to train. Might it be reps, sets, how many days a week to train or whatever. Give any new program or exercise style a good 6 to 8 weeks to see how it may work for you. Strict, cheat or somewhere in the middle. Or anything else for that matter. Good Luck.
