I have a Mark 5 pro dual beam, don't have many hours of play time with it yet as installed late last year, but it works for me . I long line and it shows the structure pretty good, but not like DI will. BPS has 'em for $200 right now, something to consider. It shows structure better than the old x37 I had, a bit more detail. Suggest you go to BPS/Cabelas/Gander Mtn where they have 'em on display and play with 'em, see which one you like, can operate easily and afford.
GO BIG ORANGE !
I meant to behave, but there were just way too many other options available at the time.