Does anyone have any experience with the original Lowrance Hook units. Not the hook 2. I'm looking to buy a new GPS sonar combo unit and found a great deal on a 7 inch unit with charts included for 399. It has 500w rms and can be paired with a 50/200 transducer. Just wondering if it would struggle with getting to prawning depths? I'm now using an old humminbird 365i that is starting to pack it in and it struggles to read any deeper than 300 feet. Any experience would help!