heres a few reviews:
http://www.lordpercy.com/tom_tom_go.htm
indepth review here : these guys ive ordered most all my GPS stuff off (recent purchase) and speed camera detector. they come highly recommended
http://www.globalpositioningsystems.co.uk/editors_reviews.php?product_id=2278&category_id=&r p=viewprod.php&PHPSESSID=573dbe30782b0b8a5235ab923 97e8845
i believe u get the same maps as for tom tom 3 PDA version. that gives you UK and some European main roads.