The website is brilliant as I can reserve my seating directly and it comes in handy when I am planning ahead.
However, when I am on the move, I would like to rely on the app, but simply put it is just unfinished. You can add movies on your watchlist, but in the app there is no watchlist tab/function, and you actually have to go to the app to see your list. You cannot view the reservations you have already made from the app either, neither can you make reservations directly from it.
I think the app has massive potential of being useful to every Cineville members. But, right now, it is just a shell of what the website offers in length.