Most of the issues are around alignment - and the cheap fittings used. Some of the sliders were only attached with one screw - in some of the cupboards, they guy probably tried three or four times to get the alignment right, and still got it wrong.
Then - I'm sure its the nature of these push to open sliders, but they don't align properly when the cupboards close, so about 80% of time time the drawers are 5-8mmm out of alignment with the neighbouring cupboard - it drives my OCD insane.
If you look at the 4 drawers - you can see the second one isn't spaced correctly both horizintally, and vertically - how you get that wrong is beyond me, its literlly out on the x,y and z axis.
Ideally I want to replace them with soft-close (with handles, or the notch at the top) - so they rest against the cupboard frame.