i have two rotties that are 125 + pounds each and can be very stuburn and require some behavier training.was looking at the DT systems super dog EDT 202.two collars one transmitter,its just about the only one made for two dogs at a reseanable price.is this a good unit and is 299.95 a good price.on DT systems web site they want 379.99 for the same unit.found the 299 price at gun dog supply .com.any body have any experience with this system.