I have found them to be very popular with young people. Having read it personally I think it is pretty good, and it seems petty to even mention that I really don't see the need for a year Zero (was Kel being serious?). Christ was born at a point in time, and it is appropriate for the year ending with his ascribed birth date to be designated 1 BC and the year following to be 1 AD. BTW, when I was teaching RE, I found that most kids though AD stood for After Death, so I had an opportunity to explain what it meant. Kel's work is of interest to people of all ages, and I have never had anyone to my knowledge say "No thanks" when I've made the offer.

My wife is in a nursing home where most of the carers are from non Christian countries. I have leaving copies of this mini-dictionary for 4 years and many have been taken. Easily the best for people with no understanding of Christmas. Just hoping for an Easter version.

A wonderful tool we included in Christmas gifts to our many and varied neighbors who are very friendly but either politely uninterested in spiritual things, heavily engaged in new age, disillusioned with the church, very young Christians, or just never heard/thought much about God at all. It was also interesting and informative for the kids of families we gave this to.
An interesting, informative, non-confrontational way of directing some attention to Jesus at Christmas, and encouraging a little thought into often unquestioned traditions, songs, words etc.