I am delighted with my Blackspot Road Angel. That is one of the GPS based devices. Halfords price is £399 but it is possible to get it for about £320.
Updating the database takes seconds even on a slow internet connection.
Obviously it never misses a speed trap it knows about.
I also have a Fireblade motorcycle. I did not buy that to ride slowly.
I adapted the Road Angel to use on the bike too. See my website
www.coolbiker.co.uk Does the additional laser detector work? I have not been gunned for a long time so I cannot tell you.
The best part is being able to relax about cameras and attend to driving. Now there is two of us looking out for me! Indispensable.