I don’t have any first hand experience, but I do understand and agree with why a project should be tracked this way. Your planned value will create a target to aim for by a certain date, the earned value will put a dollar amount on what work has been completed and when you take them both into account you will be able to see monetarily how ahead or behind schedule the project is. Now the more important indicator, in my opinion, is the cost variance because you may be on schedule when comparing the earned value to the planned value, but when you check the earned value against the actual value you may be over budget. So it is important to consult both SV and CV during the project, I wouldn’t take one metric without the other.