Take a look on any website you choose, TOMTOM is always the number one seller not Garmin, not Michellan, nor any other of the numerous contenders. The money you put into this for bluetooth phone connection or ipod control is rewarded a hundred times over. The One XL is a great entry level unit, however you can pair(add) several bluetooth phones on the unit, and switch between them at a touch of the button, even download phone books from each mobile and store seperatly...this unit far exceeded my expectations, brilliant.
My first gps was a Tomtom one which did exactly what it said on the tin, however when the time came to upgrade I foolishly decided upon a Navman N40i which was a huge disappointment ( first one was clearly pre-owned and in poor condition, second would not update and help line proved less than useless). So I went straight back to Tomtom, this time with a GO710 which is fantastic. The touch screen is responsive, the docking mechanism is very positive and the huge amount of features are awesome. I had the unit updated and conected to my mobile in no time, overall a very user friendly sat-nav.
My only complaint about the system is the outdated maps, the points of interest are woefully inadequate for example according to my Tomtom there is one car park in the whole of Cornwall when there are actually nine in Newquay alone. Despite this I am still giving the 710 top marks because the other gps systems maps seem to be just as outdated.
I recently "upgraded" from a Garmin i3 (running Navteq Maps) to a Tomtom Go 710. This was a carefully chosen product based on the fact that I would be driving in Norway. I selected tbe Tomtom Go 710 as they claimed to have the most complete maps of Europe installed including 99% coverage of Norway. Many of the locations I am visiting are not mapped on the Teleatlas product! However, it turns out that the corresponding Navteq maps DO have these locations! In the UK I have only been using the Tomtom for about 600 miles and in that time I have found more map inaccuracies (or Normalisation issues as Tomtom call them) than I had found in 2 years and 15,000 miles of use of the i3 (including numorous occasions where Tomtom tries to navigate me the wrong way up a one way street!) The optional TMC unit is also very sporadic in its functionality. Given the purchasing choice again I would chose a Garmin Nuvi 660 (slightly more expensive but you get what you pay for!) On the plus sides the numerous customisable features are nice. I think all in all if Tomtom stuck to Navteq maps they would be able to offer a much more complete product for slightly more money. I was also annoyed to buy the Go 710 with the "Latest Maps" only to find out that the month later the next version was out. Tomtom want about £100 to upgrade with a still wildly inaccurate map. I would pay somewhere in this region for a Navteq map, but would not put my hand in my pocket for another Teleatlas product as they are not accurate enough to warrant my hard earned money.