I haven't played with one yet, but I've looked at them. For a serious tool, at this point, you should be able to avoid the wooden ones (and not a bad idea when with people who might think it is something else- check the archives for the last time we had this discussion).

At my favorite survial gear place online, I found these:
Economy model
aluminum and lexan
Way cool pen size with ferro rod

I'm thinking some tax money might go for one of those latter ones.