can only speak of the Mark 5 pro.
Had two of 'em on my Tracker PT 175, worked great, no complaints at all with its performance. Worked good on the console with the ducer mounted to the transom, and had the other mounted on the TM, no problems either. Has a scroll back feature to review recent activity if you want to review something you "may" have missed, has a flasher option, split screens, etc.. It is B&W but the screen is easy to see in daylight. The ONLY complaint I have about the unit is if you use/prefer the "fish ID" option, the actual fish icon is very very small. i'm not sure if you have an option to change this size of the icon or not. If you will be sitting at the console and using it, no problems, but if the FF is beyon arms length, and you don't have eagle eyes, then I would recommend not using this feature and rely on the "arches" for fish location. I upgraded to GPS on my boat, and put one of the Mark 5's on my kayak, worked great there as well. have since upgraded to gps on the yak as well.