I picked some up today since I dropped my WD40 can and poked a hole in it. FWIW, I dumped what was left of the WD40 into a clear spray bottle, and it actually separated...some white, light wax like stuff.
The PB 50 is scented! It smells like vanilla or coconut or something...
Actually, I could not find anything that really needed lube, but I sprayed some on/in a doorknob and on my hand - felt a lot like WD40. We'll see how it penetrates.
I don't know if I'll use it instead of WD in the future - WD is not the greatest stuff, but I take care of things well enough to notice less difference than some might. It is cheaper, and they do sell it by the gallon. If it penetrates any better than WD, I'd consider buying more.
The scent does linger. Might not want to use it on your gun.