I bought a Humminbird this year and have been very pleased with it. The model I bought was the ICE35 which is on the bottom side of the models Humminbird has out. If you step up to the next model you get a digital screen, with 3 color display. With its large knobs and easy to read flat screen, it is very user friendly.
I have fished with it next to an FL-18, and an LX-5, and have not had any problems as far as interferece goes. I have also noticed the unit is quieter then other untis are. You don’t have to listen to the hum of the unit running.
I have used it all winter and have not had it freeze up, even on the coldest of days. The battery life is great in these situtations as well.
When buying a flasher you should look at what applications you are going to use it for and that will help you get the correct unit.