Very happy with MonoWall, too !
I have tried Zyxel (correct), D-Link (big shi**), pfSense (more features, but huge and slow compared to m0n0 and dont work good with firewall states) but m0n0 is the best !
Small, light, quick to boot, powerfull and stable : very good job, thank at all.
I use it on an Alix board (
www.pcengines.ch, great boards at good price).
The only thing I wonder is the developpemnent, actually for Alix boards the m0no version is beta (but works great), and some features are missing (auto PPPoE deconnection for exemple).
One more time thank all developpers for this great software