[Quoth]

I have the Kobo Aura H2O (the original H2O with flap and micro SD card slot).

PLUSES
1) Page turn buttons
2) Slightly larger and better resolution screen means more PDFs are just about useable
3) Faster page turn on PDF (too slow on most scanned PDFs on Aura H2O)
4) Natural colour possible on front light.
5) No fiddly cover over USB socket, which inevitably breaks off unless you are amazing!

MINUSES
1) Holes in textured back pick up dirt
2) No lock on orientation! It still flips 180 degrees if set to portrait or landscape making scanned PDFs nearly unusable as it's then too slow to change back! Idiotic when the GUI options are Auto, Portrait, Landscape. Should have more options or a Lock option.
3) No disable of page change by touch screen. Idiotic when there are buttons.
4) Capacitive, not IR, so without light it's slightly greyer than Aura H2O (actually the same as Kindle PW3, or very similar).
5) Power button on the back. Stupid move simply to make front sleeker?
6) Some PDFs are actually landscape, but need read in Portrait Mode, held in Landscape orientation. Thus the 180 flip software interferes with reading. There needs to be a complete LOCK on orientation.

Fair bit cheaper in local Argos in Euros than Amazon GBP (£, no Amazon Ireland!)

There is 6.7G Byte free after setup; it updates to 4.18.13737 during setup.

Copying about 1850 epubs and some PDFs from Calibre wasn't any problem and took only a few minutes to copy and a few minutes to process after eject. Older 3.x Calibre on Linux, not upgraded anything since 4.x was released.

I'll be happy to have the improved resolution & size, though shame it's not as bright in ambient light, no doubt due to capacitive (cheaper now than IR). The page turn buttons are welcome.

How is a HW reset done? The Aura H2O has a button.

Firmware issues common to All later Kobos with this version:
There is the same problem for ALL Kobos with no Home Button. No quick access to home if you are in the book via search or collections or My Books.
Also removing ability to turn off WiFi after Wikipedia or Google in the book was a backward step.

It does of course charge on PC or any USB power source, just like earlier models, phone or Kindle.

EDIT:
I got the Black/Noir as white shows up scratches more, makes screen SEEM darker and can sometimes yellow due to migration of flame retardants (takes maybe 10 to 20 years). My Kobo Touch (c revision) is white. Kobo H2O black. PW3 is black, Kindle Keyboard is slate grey, Nook Simple Touch is black, Sony PRS350 is brushed alloy and white plastic sides.