Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Slow & buggy

This topo map software was a severe disappointment. . Opening files slow even on a newer iMac running OS 10.5. It takes over 3 minutes to open a file with a saved route and zoom in to the most detailed level. Scrolling across a map is painfully slow.The software crashes frequently when trying to use features such as marking a route or calculating an elevation profile along a route.In addition, the road information is very inaccurate. The red line road overlay shows non-existent roads, roads that have been closed for decades, and private driveways. Apparently this product was not integrated with the data from the Trails Illustrated maps which are also published by National Geographic.