I just installed the Comic Book Lover app on my iphone.
I don't have a tablet but this is one of the big reasons I could see getting one, as a convenient digital comic reader. But for now, this is better than sitting at a laptop or desktop.
I was planning to use Google Drive, but when I saw how easy the FTP appeared to be, I tried that first.
Under Transfer -> FTP I found the connection settings for my phone over my wireless router, as IP 192.168.1.2 and port 20000. I left the phone on this view.
In Filezilla, I connected to this IP/port and found an empty directory.
(If failing to connect, disabling and reenabling wireless on iphone seems to help)
I transferred over a test CBR file with drag/drop.
On the iphone, the "Add To Library" button was now enabled.
After clicking it, I saw the message "Finished, 1 comic added to library". Easy as that.
Under the Library, I found the comic listed as (Unknown Series). The metadata tag icon allows setting the title, series, issue #, etc.
The comic reader view looks ok, especially good in landscape view and zoomed in.
Although in this view, when turning the page, it zooms out and then back in on the next page. I don't really like the zoom out and back in, i'd rather have it stay zoomed in and just go to the top of the next page.
Otherwise, I'd say its a nice reader and definitely convenient for me.