Can't address 885 or 476 as I've never used them. 915 is still going strong after 6 months, 845 almost as long. Can't really say as I wax at least every 6 months. The difference being 845 is so effortless to apply and remove as it's a liquid. It's around $14 for a bottle that seems to last forever vs 20 - 30 bucks for 915 depending where you buy it.
TL
I get it all for 10 bucks where they make it on Lincoln Ave in Utica NY
