Personally, I would never purchase a knockoff. I think it’s because I admire the designer and the work they put into the item, too much to do so but I can see the appeal for other people.
However, I am totally for high street versions of designer items because it’s the most economical way of experimenting with a trend, that probably won’t be in style no longer than a month. For example, these Alexander Wang style boots courtesy of Forever 21
But when it comes to staple wardrobe pieces such as a Chanel bag or a Burberry trench; it has to be the real deal