The FB is great for portabilty and ease of use but the transudcer cone on the older ones is really to narrow. The new version made by Humminbird has got to be better. For you technical types (ok I am an engineer) do the math. The originall Bottom Line FB has a transducer cone angle of I believe on the order of 9degrees. My 343C has a dual cone with the outer cone being a 60 degree.
Not a knock on the FB but once you look at the difference it is amazing how much more you can really see with a wider cone.
I sure do agree that the old Bottomline Fishin' Buddies had too narrow of a cone looking straight down. My Bottomline Fishin' Buddy would very rarely spot a fish looking straight down. The new Humminbird Fishin Buddies don't have that 60 degree cone that your 343C has, as the specs for the 110, 120, 130 and 140c models all specifiy a 34 degree cone, which is still much better than the old Fishin' Buddies.
I'm thinking about buying the Humminbird Fishin Buddy 140c model, but I noticed that the 6 AA batteries only last 16 hours versus 30 hours for the B&W models (and that's without the backlighting). So it does appear that the color screen uses up about twice as much power. One of the reviewers on the Cabela's web site said he only got 11 hours from one of the B&W models while using no backlighting.
Another thing that I noticed while looking over the online user's manual for the 140c is that there are two external wires that connect the back of the screen to the battery case. If you hike around in the sagebrush as I often do, you have to be careful that those wires don't get caught on something.
I stopped by Cabela's the other day to try to take a look at the 140c, but there apparently is a delay with Humminbird delivering the units to the stores. That store in Lacey has 5 on order.
Rex