I had a Lumia 520 and I was really impressed with the offline map feature. When travelling it's great especially at remote places with no phone coverage and also save on data roaming costs.

Unfortunately I lost the phone so I went to buy a Nokia X as it also has the offline map feature, has dual sim and is cheaper than the Lumia 525 So far so good, just going to keep it stock as all the apps I need to use are available on Nokia Store.