I`ve had 3 or 4 different brands over the years and one by one they all died. Usually one function goes, then it`s all down hill from there.
Bought a Garmin 140 a couple years ago and so far......so good. This past week my olderst F/F died. So, today I ordered a new Garmin 140 from Amazon. Rest assured if the "140 " didn`t work ok, I`d be a little leary of buying another.
The only problem is if you mount the transducer on your Trollimg motor and get into shallow water it`s the first thing to hit bottom. Sets off the motor some due to the mount design. On the plus side, you can mount the transducer on the hull or T/M.