I don't read many digital comics outside of some watermarked advance press PDFs I'll get sometimes for stuff if I ask nicely. That said, I know ComiXology was the place to go for (legal) digital comics. Now, it is a hot freaking mess. They changed the way the site/app/whatever functions (to my understanding they wanted to better integrate it with the owner, Amazon) and everyone is upset from regular folks to comedians such as Patton Oswalt. Updates are being made to address concerns, but my sympathies go out to anyone dealing with all this who just wants to read some damn comics.