Medtronics - 780G and New Infusion Set

Buttons on my 670G pump are becoming problematic, So, I need to get a new pump soon. Question becomes whether to take a 770G or wait for a 780G. I always run in manual mode. Running in manual mode, is there any significant difference between the 770G and 780G?

I can’t consistently use the Quick Set infusion sets beyond 2.5 days. Changes to the infusion sets and tubing seem to be mostly about insulin preservative. Any change in materials or experience that indicates less irritation, lumps, etc. with new extended infusion sets?

The 780 G looks the same as 670 G to me. I have 670 and am trying to get a 780.