Just last month I found myself in need of a source of map data for a personal use application and thought of OpenStreetMap which led me to looking up my home address. Unfortunately I couldn't find my address by searching, so I zoomed in on my neighborhood. About 50% of the street names in my neighborhood were incorrect, so I spent time correcting them. The last time I had visited OpenStreetMap was about 4 years prior. On that visit about 1/3rd of the streets in my then neighborhood didn't appear.