I have to believe that BS is not a detailer as the name implies but rather a spray wax/sealant. It may be a watered down version of NPS for all I know but it acts, looks and is priced like a quality spray wax.
It is thicker coming out of the bottle than any quick detailer I've ever used and for that reason I have not used it as a minor dirt cleaner like I have other QDs. Unlike most QDs, I would never consider putting BS on anything but a spotless and clean car. I have never used it as a drying aid but that might make the spreading and buffing a little easier. Like its big brother NetShield, it has a tendency to grab the towel, although not quite as much as NS.
The beading is great and I like the looks, especially on my "Diamond White" Mercedes paint. What I consider a bonus is that the car does not hold dirt and minor road grime and always looks clean. This is an excellent product, as are all the Sonax products I've tried, but it is a "spray wax", not a QD.