Like Kooty said, it’ll be a marked improvement if you decide to pull the trigger. At the same time, if you were considering buying new, retail this year is $449. For an extra $150, you’ll be getting a little bit more power, but also the auto-tune technology new in last year’s (and current models) offering.
Because of variances in every transducer ceramic (196-202kHz), matching the transmitter output to the transducer had always been a task. The auto-tune feature not only cinches up the play in target frequency, it aids in preventing tuning issues over time. All of which sounds overly technical, and isn’t something you’ll notice working in the background. However, esp. for people that need to develop trust in their sonar (is that a fish or isn’t it?), this feature ensures better sensitivity, finer resolution/accuracy, and as an added bonus helps to filter out clutter and enhance interference-rejection.
If you were thinking about attending the ice-show, I know Thorne Bros. typically teams up with the Marcum guys to offer a show-special.
Good luck, you’ll be happy with either decision!
Joel