Firstly after reading some reviews I opted to pay a little more than the min price and ordered direct from Amazon hoping I would get the original product. Thankfully the item arrived in an original fully sealed TomTom Pack (sealed hard plastic casing) showing compatability with GO, XL, One XL, One and Start.
With regard to using the item take care with the position. On my first attempt I mounted the disc on an area of the dash which was not completely flat and had a pattern. The disc appear to stick OK but once the TomTom was mounted the problems started. After about 10 mins the Easyport became unstuck and continued to do this every 10 - 20 minutes irrespective of whether the 'sucker' was dry, clean, wet etc. After the 4th attempt the dash disc then also started to show signs of movement.
I therefore removed the disc (The glue can be cleaned off with warm soapy water although this does take some time and I would bet on some surfaces leave a mark. I would also guess that the disc cannot be successfully re-used without some more glue). The second disc was then positioned on a relatively flat and smooth part of the dash (which was cleaned prior to application) and the result was perfect. The Easyport sticks until removed and thankfully the disc has also showed no signed of movement.
I am therefore happy to give this item 5* as, as long as you mount on a clean, flat and smooth part of your dash it should work realy well.