Good Morning!
Sorry if this question has been asked before – I couldn't find a detailed listing about the differences.
I am not so much interested in the sonic differences but the technical ones.
For instance I've heard, if I recall correctly, that E series insert sends/returns and bus sends are unbalanced. That there is the coathanger mod to overcome this?!? Internal gain structure is different. Or that E/G+ Modules are not interchangeable without modification. Oxygen free cables came with the G series. You see, a lot of superficial knowledge.

I you can clarify things, please chime in. Any input welcome!
Thanks,
Matt