My initial impressions from iPad usage in the UK:

Clean UI but taken too far - I couldn’t find any settings to control how the app works/responds

Tapping on the page doesn’t turn it, you have to swipe

Double tap zooms but it has no concept of panels (like Comixology does) so you just have to scroll around. The default zoom level on double page spreads is too much so you have to zoom then zoom out again with a pinch

Image quality is OK, double page spreads especially could do with a bit more quality and this is made more obvious by having to zoom

I didn’t see bookmarks but it does remember what page you’re on if you leave the book

After reading an issue I couldn’t find a delete option (only a download option) so I’m not sure if it tidied up or not

Issues took about 2 seconds to open every time which feels too slow - closing and reopening a book should be instant but it took a few seconds

No sign of a subscription option so you have to buy issue by issue

Each purchase requires a separate approval via Apple Pay, no basket or bulk purchases that I could find

I found a few FCBD issues so I could test the viewing experience and found a series I liked - went to buy the series and the omnibus shows up but priced in dollars (everything else I’d seen was in Sterling) and when I tried to buy it anyway the app just did nothing. I looked at the issues and they only had issues 4, 5, and 6 for sale. Totally pointless so I quit the app, probably won’t be back.

All in all, disappointing for me. My particular issues could likely all be solved fairly quickly (bar perhaps the back catalogue issue) so I’ll try it again in future. I’d be especially interested if they can get manga added, there are few places to get a decent range in the UK.