Hi Daniel
I got 1, great sounder. have had no probs whats so ever. the detail is amazing. I use it for offshore(74m is the deepest so far) and prawning in shallow water. I use the bottom lock all the time.
Come along to Col's open day November 13th at bribie. I will be there with my boat, see 1st hand how good they are.
Price not bad, Check with Col (fisher boats)
Michael