I discovered the SatNag just before last Christmas and many of my friends received it as a present. Having enjoyed mine throughout 2009 I bought additional copies and gave one to most of the rest. It looks like a sat nav; the female voice sounds like a sat nav but the comments are a host of female nags to a male driver. Sexist, maybe...but great fun (and recognisable) for everybody. I have no idea how many comments the pre-recorded voice contains, but it seems endless. A year on, after constant use, I am still hearing some for the first time. Highly recommended for anyone with a sense of humour!