If, like my wife and myself, you have run through the BBC's various Christie series, these are a good find. They are a bit dated, but I prefer a good story to a click production. More is an excellent Father Brown, soft-spoken, witty, but sharp and persistent.
These stories are from a bit earlier in the mystery genre than most adaptations, and this dates the series as much as the productions. Chesterfield's stories tend to be more "howdunit" than "whodunit", with the focus less on the characters than on the murder itself. This can be a problem, at times, but it can be very good, especially when combined with good characters.