It does. It was updated a couple of months ago to use the new pfctl framework of -E/-X to enable/disable the firewall and uses the existing hooks in the firewal

It does. It was updated a couple of months ago to use the new pfctl framework of -E/-X to enable/disable the firewall and uses the existing hooks in the firewall to automatically insert/remove rules as necessary. I've used it extensively on Yosemite.