SnDog,
We have had the forward scan for two summers and I am still learning its capabilities. I have found it very useful when creeping along in tight areas with steep banks but have found that it doesn't beam so far ahead that I think that it has much use at faster speeds. I set mine at 75 degrees so that it has a bit of a down angle and I can watch my anchor go up and down. It has a twenty degree spread athwartship so I can scan an anchoring area by yawing with the bow thruster while not moving forward. It is fun to use, it saved me once from running aground and this year I am going to take it out in a controlled situation and try to get more comfortable with it.
I also have port and starboard side scan sonars (Garmin GT51M-THP) that look down and up to 51 degrees off either side. These have given me some astonishing views of the rocky coast of Maine.