Elevated walkway in Calgary, Canada

I like the idea of an elevated walkway that allows people to walk for a long distance without having to cross roads or get up and down the bridges. I saw the walkway in Hong Kong and in Taipei. Here is another example in Calgary, Canada called the Plus-15 system. The feedback from the citizens are mostly positive.
http://www.calgaryherald.com/news/calgary/Share+your+experience+with+Calgary+famous+elevated+downtown/6800081/story.html