I’ve been using Hands Off! for the functionality for the past few years, but if I had known that the functionality was based on your kernel extension, I would’ve switched away from Hands Off! in a heartbeat (I already get the firewall features of Hands Off! from Little Snitch, so the only reason I use Hands Off! is for the disk access control feature).

Out of curiosity, could you provide a link to the website advertising your kernel extension (if it still exists)? As an OS X user, I feel pretty bad that I wasn’t aware of its existence (I would’ve certainly recommended it to my friends).