Thanks for your replies.
It would seem as if no-one has actually tried one of these as yet and so my choices are:
1) ask my family if they would like to give me more money to buy a unit as the amount that has been contributed to my present pot is insufficient to allow me to be able to afford a Navall (and I don't even want the Sat Nav option)
2) take the plunge and try it
3) stick with my existing set-up and spend the money on something else
As I'm fairly sure that option (1) would not go down particularly well, I guess it'll be (2) or (3).
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