The band I believe is used if you have unders, I had to wear the bloody thng for two weeks!!!
All it does is help push your boobies down and into the right place, as they can take longer to drop under the muscle!
The boyfriend definitely noticed the band making a difference to them!
I now use the breast band when I go running to stop them jiggling about, which is more than what any sports bra can do!! Hehe 
xxx