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.