The bird units are easier/quicker to operate, Ill give them that. IMO, Lowrance has done a better job of fine tuning the SI/DI technology. If Im not in my boat with two 798 HD SI units Im in a buddys who has HDS 7 with SScan and I am more impressed with the imaging from those. Now, I believe bird does have far superior 2D sonar, switch fire is awesome. There are pluses and minuses to both And yes, I know for a fact I need to attend a sonar siminar, pretty sure Im not using my machines to there fullest.