Delicate & normal switch, Terry & Charlie...
Terry, I was informed by one of my 'sources' that there was confusion with the green light on the brushroll (BPI) & the green light of the delicate mode for the customers.
Think for just a moment, "how do you get confused by two (2) lights." When I get in any of my vehicles, at startup, there are many lights that light up [hopefully temporarily], both yellow & red. (I sure hope 'these people' who got confused, don't drive. ~~lol~~)
I think it was more pure laziness on PROPERLY teaching the sales staff by the distributors; which in turn resulted in IMPROPERLY teaching the customers. (imho)
I always showed it, taught it, & I use it regularly.
Charlie, some of the places that different people like its benefits are for more delicate items, such as lamp shades, mountings (ie: fish, deer, birds, etc.) especially if the taxidermist didn't do the best of job, trophies (ie: best monster vac, best restoration, most unique & rare AIR-WAY, etc.), or possibly even some plants especially with larger leaves.
Another benefit I've had customers appreciate is if someone is sleeping or has sensitive hearing, it is considerably quieter. (Huh, what did I say??? Oh wait, that would be hard of hearing. ~~lol~~) Keep in mind you don't want to use it in the delicate mode all the time, as you are sacrificing some cleaning ability.
I hope this was helpful & informative. (If not, oh well. ~~lol~~)
Seriously, cheers & have a greater day than the last one,
Bill