The transducer with the G2Ns is new. The SI ducer with the gen1 helix models is the same as the xx98 series. The new G2N SI ducer has the dedicated DI crystal. Not to mention chirp and MEGA imaging!
What I can’t answer is whether the 7″ screen with MEGA will show anymore detail than the 10″ without. I don’t doubt the clarity will be better, but will it be useful on a smaller screen? IDK. The MEGA DI will definitely be better on the G2N simply because of the dedicated element.
Keep in mind, if you currently have HB SI, there will be added expense of a new transducer splitter cable if going to MEGA.
I will be seeing what kind of deal they are willing to swing on a Helix 10 Mega G2N at the sportshow.