Seriously, check the specs on it, there is a long list of units that the Hi Def transducer is compatible with. Yours may be on that list. The shots i seen were pretty impressive.
Ive not seen live images of Mega...just demo in store which i personally dont put much credit into....just my opinion. But if a guy already has a compatible unit.....$600 is a good price point in my opinion.
Plus, if it is comparable image quality wise, Birds prices will drop. Which that in itself is great.
I dont know everything im looking at either really. I can take some educated guesses, but thats about it.