The dedicated RoadAngles just for Speed traps are ace, there multi satnav thing is the rubbish...
I have used TomTom since they was launched, and i spent two years selling GPS when i worked in retail, and can vouch that TomTom is the best all around GPS, the thing just works out of the box.
--- With regards to that roadangle GPS, i had to do a trip from B'ham to south devon, it took 5 mins to calculate the route, then told me that the route was to long, and to re-enter a shorter route.
I have taken TomTom around Europe, and its great at telling you when the cameras are coming up, in germany i cant even visually see some of the highway speed cameras.
TomTom offer a paid subscription service, but as said, you can get the free ones of the net, however, I have always stuck with the paid service, think its only £5 per month, and keeps those points and fines away.
NavMans I recon are the next best thing to TomTom, and have a few "cool" features. But, why have the next best thing, when the best thing is the same price.
TomTom has loads of pretty good addons, and they work pretty flawless, even the traffic systems works "OK", not always right, but is sometimes.