I've read on just about every Frog Lube thread that it's actually just repackaged roller coaster track lube. No proof of this, but now this thread has mentioned it too.
I've not been interested enough in Frog Lube to buy any. I've seen it used by several guys at the range and it doesn't appear exceptional in hot, dirty ARs.
I've experimented with a pile of gun lubes over the years but been consistently happy with Weaponshield. Fireclean is the next one I'm trying based on the user feedback.