Firstly, image quality is INDEED better, because images are saved with less compression. That alone is useful; it makes a big difference when looking at details
However, usability is a big problem. Whereever theres switch, there is display to show the current setting of it. However, the display is not on the switch; it is on the opposite end of the screen. Thus, you are constantly looking forth and back. Instead of tapping a displayed setting, you have to tap a button somewhere else (and looking quite different).
In addition, the app crashes. It crashed only in 5-10% of cases in the past, so it was relatively usable, but it crashes nearly always.
Another problem is that it needs lots of battery. So its not for everyday, and not for outdoors/hiking.
And its slow.
I like the different film formats, the different film characteristics and the filters.
Most disappointingly, it doesnt let you influence exposure time or ISO setting other than AE locking. Theres no exposure correction (+1, ...)