I used to own a garmin on my small tinny, great sounder and very reliable. The new garmins are of the same quality but I feel the screens are starting to let them down now as the B&W ones are a low resolution compared to other brands. Have used a Lowrance X52 a lot on a mates tinny, great screen and lots of bang for your buck with that sounder. Just recently purchased a Furuno 4100 for my own boat though, just due to the good reports on this site. Picked it up from the states with the 3 in one transducer. I am yet to use it in earnest, but after having a play it on the bench, it appears to be a very capable unit. One thing though is the Airmar transducer, it is HUGE conpared to any others I have owned. My old man saw it and reckened I was lucky there are pods on the back of the boat to help keep it afloat
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Goddy