Hi Maachuu, To answer your question it depends on how you fish and use your electronics to fish. With DI and even sonar you need to be moving roughly 2 to 5mph to get a clear picture of STRUCTURE or its going to look like you are motionless over a piece of brush. But with DI you don't have to be moving at all to see fish. The reason being is the footprint of a DI beam is a thin straight line shooting downward. if a fish goes through this beam it shows a blimp. But since cover like brushpiles are bigger and exceed the width of the narrow beam it is skewed so you need to moving 2 to 5mph or so.
The cool thing with the HB DI only units is they come with sonar. It's tough to see your lure with DI but with sonar it gives you that option. But it's a good learning tool so that you can cross reference what you see on sonar with what you are seeing on DI.
As for service. Joby and Greg from Humminbird are on here a good bit. Doug and I are also on here a good bit. YOu have any trouble feel free to contact any of us. Also Humminbird has a track record of servicing their units for quite a while. HB is still servicing some units made back in 1998 still servicing the old HDR600 units .
Hope this helps


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