5 years and counting
I've been using the floppyfw for 5+ years. Never a problem, delighted! An old 486 has served as my ultra-configurable firewall router so well that I've never had any inclination to purchase a consumer DSL router. All thanks to Thomas' cool distro.
A PC and four ISA cards give me a level of capability/flexibility that I'm sure Cisco wouldn't mind taking a few thousand of my dollars for. I've also used floppyfw to build a gigabit firewall/router for my university. It has performed flawlessly.
If you have an interest in learning iptables and need more than you can get from any consumer device, I highly recommend floppyfw.