Hi grizmom! Yup, have kept one for over a year (with a gap or two) and agree with you that they can be very useful and provide helpful insights. For me, one of the biggest bonuses is visually being able to see the patterns. I am very challenged with time frames (and time in general) and when in the midst of an episode lose all perspective of the other pole. Know them *intellectually*, but because I'm not *there* at that time, can't fully acknowledge their reality, if that makes any sense... Seeing them can help a bit with perspective.