Marcum, Vexilar, Hummingbird, Lowrance, and the Showdown are all good units. Some have more bells and whistles than others. It is like the Fishhawk, Depth Raider, Subtroll, and Cannon speed and temp units debate or the Ford, Chevy, or Dodge debate. It is all about personal preference. I have a Vexilar FL8 SE ultra pack and it's fine for me. I only use it in dirty water or laketrout jigging. All other applications I use the camera. My reccommendation is to find people with each brand and watch them or ask if you can try theirs before buying. That way you can decide which unit best fits your needs.