I have a Garmin bought about 4 years ago and it was great. Last August I bought the lifetime map updates for £79.
I have downloaded the new maps but here is the difference.
Driving up from Cornwall to Aberdeen say 60 miles south of Birmingham on the Motorway it says drive for 40 miles, then two minutes later take a left and it took us through lots of towns and back on to the motorway after 45 minutes.
We were traveling from Matlock to Backwell in the Peak District and it said drive for the next ten miles then 2 minutes later it took us on a magic mystery tour and said you are at your destination.
We then followed our nose and found Bakewell signs again say about three miles off course.
We have since updated it say 5 times and we find if you ask it to take you to a particular post code or say a specific street in a town it is great but again if you just say Montrose or Grasmere for instance it will get lost and take you to say within 5 miles but not to the center of the town.
eddie