This is a great item, well designed. However, a couple of things.
The instructions are minimal. As a result I ended up redoing it a couple of times, taking all the screws out!
Make sure you put the two pieces of the frame together before you fix it to the floor. You cannot pull it out to put the top part in afterwards. Not without taking it apart.
Ensure that you have the part that slides out facing the door. This was my second error. Took it out again and fixed it,
Another issue I had was with fixing the plastic bits to support the baskets and then sliding the baskets down onto it. This was VERY tight. Some explanation would be good. What was I missing? I suspect I should have put all three baskets in at the top, then slid in the plastics for each basket and slid it down. And then the next and so on.
Finally, the height adjustment screw got in the way of where I put my bracket to fix the door to the unit. I was not sure if I could have just moved the screw to one of the other holes. Probably. Not doing so meant positioning the door correctly took me the most time as I had to measure everything to make it a good fit. But once I did it, it was simple.
I also did another side mounted pull out shelf set under the sink. I have a left over shelf that I will probably mound to the side of a cupboard using a drawer slide. Just what I need for utensils.