Looked at a lot of pull out shelves before purchasing this one. The discounted price was icing on the cake. They come completely unassembled so it takes a bit of time to complete them, place precisely, and install. It’s not difficult, at least for most, to install them. I found there is one inherent flaw on all of the different models and types I purchased. They all use extremely small Chinese metic screws that are garbage. They will work but DO NOT USE DRILL DRIVERS OR POWER SCREW DRIVERS to install them. The heads strip off in a heart beat and they will break off. Even with a well fitting hand screw driver they can strip or break when tightened enough to keep the constant movement of pulling out and pushing back shelves is done daily. My advice is definitely use red high strength locktite. If you want you could also trash their screws and replace them with quality USA made screws. They may be difficult to locate the right ones however.These shelves fit perfectly in my cabinet with very little unused space left on sides, back, and top. They come right to the cabinet door with no wasting of front space either. The wood trim on front pullout if good quality real wood and not only feels good on the hand but looks great on opening.They slide effortlessly and extend at least 3/4 out making it easy to get to back items. One of mine is loaded with many heavy 120 year old Erie cast iron plans that weigh a ton. When extended the shelf doesn’t flex or bend and shows no sign of trouble handling at least 40 lbs of cast iron. They are attached to the back cabinet wall on all four cabinet sliders making stable when pulling heavy shelves out fully.These things have transformed how our kitchen operates. It’s night and day. We are seniors now and it was just plain hard getting on your knees looking around and trying to dig out things way in back. Now everything comes to us with a finger pull! Amazing difference. I wanted these 30 years ago. Why did I wait? They will last a long time as well built as they are. Go ahead buy them but be very careful to buy the right size. Also keep mindful of cabinet door on inside corners. If the door handles are large, and touching another cabinet on a 90 degree inside corner, the shelf may not pull out without the shelf runners touching or badly scratching the inside of your cabinet drawer. You may need to use a narrower model on that cabinet.Good luck.