Chas, I also just purchased a raymarine dragonfly pro. I am a perch, bass, walleye guy. I have used the unit now six times and love it. The biggest plus is that it is " idiot proof" The first unit I have ever had that you don't have to go through the manual to figure out how to use it. I am not too sure about the effectiveness of the down imaging though. On Erie the past two trips, the sonar mode was great for spotting those bottom hugging perch and the fly by lakers, but I can't seem to see the detail when I use the down imaging, I guess I should play with the sensitivity a little. The other great plus, is it didn't break the bank, about $350 on sale with rebates, and it included a Navionics North America chip that works great in Erie and the Fingerlakes.