There is a low Q 2D transducer in the G3n Mega + units standard transducer which will improve 2D. The G2N units can use the low Q 2D transducer, but care has to be taken with unit settings to prevent possible damage.

SI and DI images may be more sharp .... even within the range of the G2n units .... due to the extra power in the + units, but I haven't seen any comparisons that prove that.