Color is good enough to read comic books on it, the google drive integration means it's not too hard to get my CBR/CBZ files on directly. The annotation / notetaking featureas are nice (I haven't leaned into them yet, but they work well even on the small screen size), plus all the regular stuff with normal book reading. Also, since it's kobo/rakuten, the libby integration is better (search and select library books right from the device).
The actual reading app is maybe 90% as good as reading on the kindle (or a more specialized reader like perfectviewer on android). There's some annoyingly fiddly features- font size is kind of weirdly variable, when going through CBR files there's no "read next in the folder" gesture nor is there a "this is read/unread" state in the google drive ui, so you always have to remember which book you are finishing when opening the next in the series.
I tried out one of those boox readers with the android apps, which would be even better software-wise, but the boox hardware seems like garbage (for an N=1 at least). My display came with several rows of stuck pixels, and apparently it's a good thing that I ordered from amazon instead of the boox store, because the reviews indicate getting an RMA from boox directly is a pain.