Has anyone had any experience with the Raymarine Dragonfly sonar/gps unit? I only seem to hear reviews from saltwater anglers and those who work for Raymarine. I have watched the you tube videos and seen them first hand in the store. It seems to be perfect for fishing under 300 ft and at lower speeds. The ease of use also seems to be a major advantage or other complicated units. I am just curious if anyone here has actually had one out on the water? Any insight or reviews would would be appreciated. Thanks in advance!