I've contacted Humminbird, talking on the phone with a tech, twice since I bought my Helix 9 two years + ago, and in both cases the techs were easy to reach, expert, pleasant, efficient, and gave clear information.  Much different than most support experiences.

Just used them alot, they were excellent. Just got a Helix 7 G3, with SI and DI, put in a portable pack for canoe fishing. Came with wrong transducer, only one side worked for SI, instantly sent out another transducer, now just the other side of SI worked, they sent a shipping label and 10 days later everything returned functional. Second transducer was defective. My 3rd Helix, excellent CS, unlike 30 years of Lowrance and to a smaller degree, Garmin.