I'm trying not to write a wall of text, but I can't simply say "yes" or "no".
First: I suggest you take a look at that matrix:
https://wiki.mobileread.com/wiki/E-bo...x#6.22_Devices . It lists 6 inch hardware, see if you like the features of the EB600/CoolEr.
The CoolEr software has some flaws which probably won't be fixed. But you might be able to use different software if you are willing to take the risk of bricking your device.
Or you go for a Kobo - they use a different software than CoolEr and are still developing updates.
The price shouldn't be that much different.
This is now just
speculation, but I'd suppose you could buy a Kobo and install the CoolEr firmware on it - then going back to Kobo using the SD card update.
All in all, I'd be torn between CoolEr and Kobo.
NoteJust to be clear, when I say you could try different software, there always is a risk involved. It's your money. Do what your guts tell you after you consulted your brain.