Now realising you really do get what you pay for I went for a TomTom 520T. With the latest map guarantee this adds IQ routes and lane assist, effectively transforming the device into the latest 530T. A real bargain coming in at only a tad over the Navigon, having used some vouchers I had doing nothing but gathering dust. Having used the device for around 600 miles now I cannot fault the TomTom, and realise that TomTom really do have such a good reputation for very good reason. Mapping is still not spot on, and the occasional speed limit is wrong but this is all much better than the Navigon. A killer feature for me is the FM transmitter letting me play my MP3s through the car speakers automatically pausing (And unpausing) when the next instruction gets played (Also through the car speakers).
In all, I’d really advise you stay away from Navigons… A lot of potential but it really doesn’t deliver. I’d advise you decide on a price and buy the best TomTom available… The “core” working of them is great so even a basic ONE (Available for around the £100 mark, I believe) would do a sterling job… A little more just gives greater flexibility allowing more gadgets and possibly even more maps (E.g., 530, 730, etc). I also believe that the x40 series will be coming out shortly, meaning certain price cuts to be had.