The lower end of the full frame stable but with excellent ISO capability, I use this at 3200 ISO with no additional noise reduction.
The weakness of the body is in two areas:
1) Although the AF works well in low light only the centre point is a cross point, the other are all vertical or horizontal. If these work they work well, but sometimes they just don’t find contrast. Does not focus reliable with macro lenses even on centre point.
2) Much simplified control capability compared even to my old 20D. Main issues are no feedback on FEC in the viewfinder when adjusting. Many other functions have to be accessed through the quick menu.