[Hampshire] TomTom satnav and Linux

I am thinking of getting my husband one of these (1) for Christmas and would
welcome all comments, both as to whether it would play nicely with Linux (I
gather that it runs on Linux, but that is clearly not the same thing), and as
to how good it is.

Would this (2) however be better, in spite of not having the rest of western
Europe?

Thanks!
Lisi

1.
http://www.amazon.co.uk/TomTom-ONE-V3-Satellite-Navigation/dp/B001EYTVTM/ref=sr_1_4?ie=UTF8&s=electronics&qid=12282266
2.
http://www.amazon.co.uk/TomTom-ONE-v3-Great-Britain/dp/B0018NPL5M/?tag=satisfactiong125-21&gclid=CMGLjoeMopcCFRoSFQodr06pJA