I was a little bit leery after reading some other reviews. I read that it is difficult to install, the connectors fit too loosely and the hardware is junk. I had none of these problems. Maybe I'm just a bit more mechanically inclined than some. It was not difficult to install at all. The little plugs that are used to connect the extensions do fit loosely when they are not mounted to the bookcase, but once it's mounted, they're as sturdy as can be. I can hang my 200lb body on the spot where they connect and it doesn't budge. As far as the hardware is concerned... The screws are an M10. That's a pretty big screw. If you try to screw it directly into wood, there is a really high likelihood that you are going to strip the head or break it clean off (with an impact). It doesn't matter what brand of screw. Take the time to drill a pilot hole for each screw and it will work just fine. This installed like a breeze, looks great, and works perfectly. We are completely satisfied with it.