3M Adjustable Sit Stand Keyboard Tray with Gel Wrist Rest & Mouse Pad - Ergonomic Height & Tilt Adjustment, Under Desk Swivel Storage, 23" Black Track (AKT170LE) - Perfect for Home Office & Workspace Setup

Lets start with shipping. Ordered through prime and it arrived two days later as promised. Noted the weight of the box and knew right away this thing was heavy duty. Unboxed with no complaint on packaging. Reviewed the enclosed instructions and mounting template, realizing that they were not as detailed as I would like (more on this later). Played with the mechanisms and track, this is truly heavy duty material and craftsmanship. After reading all reviews before ordering, I read several reviews about how far it stuck out if you recessed the track a 1/2" back as it says in mounting instruction. I was cautious about the mounting. I wanted the front of the keyboard tray as close to flush with the front of the desk as possible. I took the mounting template and recessed it 4" back trying to avoid protrusion. after drilling my pilot holes and removing the template, I inserted the screws as directed in the instructions. Now it was time to mount the track. Here's where you can learn from my mistake. I recessed the track too far back making it impossible to mount on the screws that I just installed (DOH!). Word to the wise, use the track as your template. I wound up putting the track as far back as it would go (see picture) which left 2.5" from the front of the track to the front edge of the desk. this wound up being almost perfect. It only protrudes about a 1/4" (see picture). I can also speak to something I heard a lot of reviews complaining about, the track stop installation. I found this to be very straight forward and simple. The entire arm and tray move right or left so you can get it out of the way for this step and for moving it out of the way of your chair (more on this later, see picture). This made installation of the track stop very simple.After completing the Installation, it was time to take this thing for a spin. I pulled it out the tray and fooled with the pitch of the tray itself. This is done by twisting a large knob and was fairly easy to do. The pitch is shown with a needle style gauge and made adjustment easy to see. next I lifted the tray vertically to get it into a comfortable position over the arms of my office chair (see picture). I was impressed with how easily it lifted into position. I wound up with it right above the arms of the chair, feeling like I was sitting in an adult high chair. it took a minute to get the keyboard into the proper position. If you set the keyboard into the space allotted between the left edge and the smallish provided mouse pad it offsets it a little too much for comfortable typing and I have a very small keyboard. I would be concerned with a large keyboard in regards to placement and comfort. The mouse pad provided ease of movement and performed very well with my cordless mouse. the wrist pad is comfortable and a great addition to alleviate pain from long term keyboard and mouse usage. I sit at my desk 8-10 hours a day.Here's where you can learn from my frustrations again. Time to slide the keyboard back under the desk from its elevated position. You cant push it down to get it out of the way. I read the instructions and I'm either blind ( I hear the phrase "if it were a snake it would have jumped out and bit you" all the time) or this step was not in the instructions. to get it to lower, you need to lift up on the front edge of the keyboard tray while guiding the assembly down. this is actually a very fluid movement once you know this trick. it slid in with minimal effort.This is the part about the entire assembly moving left or right that i mentioned earlier. In the fully closed position, I cant push the chair under the desk far enough to "belly up" to the desk. the arms on the chair hit the tray. By swinging it all the way over, it allows you the room to slide under the desk for writing or close up tasks. Very neat feature. I would have been unhappy with this product if it didn't do this.I've had a lot of different keyboard trays in the past and have never been happy. I was hesitant to spend this kind of money, but it was well worth it. it is very well built, very stable and has adjustability that will meet just about any position that I could need to use it comfortably. Very happy and would purchase it again