I upgraded from the 700 to the 720 in the RV-10 I fly --- I had (have) them mounted on the right side of the panel with velcro and the battery attached next to it. I use the battery switch as my "on-off". Readability is far better with the 720 (but the 700 was "adequate"). I do like the wifi update system.
I also have an iPad, mounted down low on the tunnel/console between the seats ---- if it was not mounted down low, I would not be able to see it very well, due to glare and washout. The 720 is much more readable.
I should mention, I have Dynon glass panels for engine instruments and MFD -- they are the older "non-bright" screens. The 720 has a brighter presentation.