Evan,
The main advantage is that you can use a lollipop float that is between 30% and 50% lighter than the conventional float you would normally use in a given flow. Not only that, but hte lighter float gives a far better prsentation, and as others above have said, you can 'lay on' or inch a bait through your swim easily.
I use a long(ish) hooklength, about 12 inches, and use only one dropper shot about 4 inches above the hooklength. The main bulk of the shot I use an olivette about 3 feet from the float.
You obviously have to fish the full depth of your swim and maybe a little overdepth on top of that.
The important part is to use the right float for the flow so you have a sort of 'critically balanced' rig that is just heavy enough to hold in the flow.
I'd suggest that you start off fishing at no more than, say, 8 metres, and when you have mastered the technique then increase the length of pole as necessary. don't forget to hold the pole (not in the rests) and inch your rig through the swim.
The only problem I have with lollipops is how to store them without damaging them from time to time.
Hope this helps.
Mark, another really nice informative article.
