I've had this on my radar for a long time. Have you ever seen what a mess a dry cem makes. The term "Insult to Injury" is what I think of with the Dry Chem extinguishers. I would still keep one on my boat as one that I would gladly pass off to some one else in need,
I think the dry Chems are like $25 each. The Haylons in the link Jason provided were like $150, imagin saying to the guy who's boat burnt down and you lent him you Haylon "hey buddy sorry about your boat but can you give me $150 for the extinguisher you just discharged! LOL