They are good until they aren't.

In the case of my 15 Pro, the limits are that you have to stick to the default zoom on all three lenses, accept oversharpening all the time which leads to flaring, accept terrible white balance and tone control, some horrifically bad attempts to compensate for zero DOF control with AI and computational photography, borderline useless night shots due to the noise, have to scrub the dirt of the lens every time you use it or get blurry photos, horrible distortion on the wide lens. It's basically three crap cameras attached to a computer to undo as much of the crapness as possible.

It's bad enough that my over 20 year old Nikon D3100 is considerably better.