Simply put price!  This little baby costs less than $150 and is small, dependable and easy to use.  What is there not to like?  The Swami does not have all of the high priced options, but it will give you accurate GPS distance to the front, back and center of every green.  The Swami will hold up to 10 courses at a time and the annual fee to download courses is $35.  You do not have to worry if your course is in their data base, as if it is not they will map it at your request within 5 to 10 days.  A small handheld golf GPS rangefinder with a small price.  The Swami, because of its ease of use is the best way to speed your round up and shoot good scores.