garmin the best i use 350c and the gps is verry user friendly i sound up to 200m with my machine and fish for trawl soldiers no problem
have had many machines but i can trust my garmin and backup service is great i had a one year garantee(not warranty) on my mach and broke a pin off the back i asked them to fix it, but because it was under a year they replaced it with a new one no prob.thats service
look at the specs of the mach you will probably find there is not much diff between the 350c & 400c only price
i recomend them to anyone if something had to happen i will buy the same again no regrets
ps dont mount your trancducer inside your hull use a bracket that can move up and down to get the trancducer into clear water makes a hell of a diff