FF,
The balanced leeches really don't take much longer to tie then a regular leech.
Adding the pin and the bead is really the only difference.
I think the advantage of them is they offer a hook point up / horizontal presentation and you can fish them incredibly slow under an indicator.
Here are a couple of angora goat leeches I tied tonight for tomorrow's fishing along with some hot spot San Juan worms. I ran out of the correct pins so these ended up being nipple headed leeches.
SF