Device or app? I've found that pretty much all technical books look terrible on Kindle devices - the screens are too small, the technical content (source) usually formats poorly, and diagrams are often screwed up. That's not unique to Manning.
I have a lot of Manning books that I've purchased directly from their site and/or from Amazon. I generally read them in the Kindle app (iOS, lt, web) or in iBooks. The only Kindle device that I've comfortably read any technical books on is the old Kindle DX, and that was just because the screen was relatively large.
Technical content and smaller e-reader devices will never be a good fit. Occasionally it's tolerable, usually it's not.
I have a lot of Manning books that I've purchased directly from their site and/or from Amazon. I generally read them in the Kindle app (iOS, lt, web) or in iBooks. The only Kindle device that I've comfortably read any technical books on is the old Kindle DX, and that was just because the screen was relatively large.
Technical content and smaller e-reader devices will never be a good fit. Occasionally it's tolerable, usually it's not.