Using a Garmin 750s, standard Garmin transducer. Fishing up to 60m, most often around 40m. Not happy with it at all.
Plenty has been said that to get to the most out of this unit requires the 1kw transducer, but with a price tag of >$1k I am going to get a Furuno instead and use the Garmin as a plotter only. Had the 620 in a previous boat and could not fault it, does seem like older technology compared to CHIRP these days, but I have full confidence it works.
Scott.