I've used Froglube on several ARs and two bolt-actions. It works pretty well. Yes, it does gum up when it's cold or after several months of sitting there. That's a drawback, but most oils I've tried evaporate within less time, and gummed up Froglube seems to still work somewhat OK, just not as slick as when new.
The marketing tactics have been distasteful and I think it's overpriced, but it's a decent product. I don't plan to buy any more though - at the moment Fireclean is the latest and greatest thing on the AR boards. When I use up my FL, I'll probably buy Fireclean if it's still getting good reviews by then. Which I give at most a 1 in 3 chance of, given how fickle lube tastes are. Every year there is some new miracle wonderlube that tightens groups, doubles velocity, cures cancer and makes you irresistible to women. I'll probably end up buying whatever "that" is in 1-2 years.