Does the manga ebooks sold in amazon read well on the paperwhite?

You can usually download a sample of manga books to your Kindle, like you can for non-graphic books. I’m guessing some artists’ styles would work better on the e-ink screen than others; you may want to try downloading a sample of each series before purchasing, just to make sure it’ll be a pleasurable reading experience for you.
It’s pretty good, I think they re-size the dialogue a little so it’s easier to read. Only gripe I have is that each manga tends to be around 100 MB each so there’s not much room to store them
And obviously you won’t be getting any pages with color