Contractors love to use it because it saves them time and money. Pay the extra bucks to have it trenched and don't worry about the extra mess you will never have to worry about hitting pipes.
Or install it yourself, If you think you might want to I can shoot you a web site that is the best on the net for do it yourselfers. Do not use the free design offers from the manufactures or you will be sorry!
I also have some other tips for you if you choose to have a contractor install your system, that will have you some major bucks down the road.