Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: Are you using the desk as a stand up desk?  If so, what length did you get and how sturdy does the desk feel?  Can you lean on it safely?
Document: There's not one but two CPU holders; as I use a laptop, I've repurposed them as extra shelves, and one of them does an excellent job holding my UPS in a good spot without using up space. I am delighted by the desk and feel sure I'll be using it for many decades.
Very solid desk. Went together easily. Seems like a great value. If you are considering a stand up desk, this is a good option to start with.
This desk is well made, sturdy, and entirely adjustable. It does function well as both a standing or sitting desk, and doesn't even take that horribly long to switch between the two. Not that you'd want to do it every day, but you could do it in 5-10 minutes depending on how much junk you keep on your desk and how prone to tipping over it is.
I am enjoying the desk. I have the 36" x 24" versa center. I chose this desk for longevity, sturdiness, and most of all ergonimic configuration for my height. My area to put a desk was also an issue for me. In case it help others to know, the assembled width using the casters w/o the printer shelf is 40-1/16 inches. Depth is 24". Depth with deluxe keyboard arm and tray fully extended is 36 inches.
I also use an external backlit keyboard and cordless optical mouse on the keyboard shelf. With a laptop I do not need a lot of the accessories that came with the base configuration. Here's what I did with them. I am using the bottom half of the CPU mounting brackets to hold my power brick for the laptop just under the top of the desk surface out of site and off the floor. I am using the top half of the CPU brackets mounted upside down above the top shelf as a file folder rack.
I've given away or trashed at least 4 ready-to-assemble computer desks in the past 6 years. Either they simply didn't meet our ever-changing needs or they fell apart. After one week of owning the 48 x 24 Versa Center, I know it will be the last desk I ever buy. My son thinks it's very cool-looking. It's sturdy without being cumbersome.
I now have a comfortable, enjoyable work station for using a computer at home. Very, very happy!
Customizable and easy to put together. Very sturdy. Good for sitting or standing. Comes with separate PC and speaker shelves which can be placed at any level you wish. Highly recommend it!
There are great instructions on the company's website if you want them, it is straight forward enough that you may not need them though.3) I had to really take my time getting all the bolts started into the desk surfaces. The fixtures they use under the surfaces are super prone to cross-threading so it takes a bit of effort to get them started straight.To summarize, unpacking and assembly could be a little easier but once assembled it is a great desk. Worth the money.
I like the table and the options to either set it as a sitting or standing or whatever layout you really want. I wish there was more horizontal support beams though because the desk can be sort of wobbly.
Answer: The versa center is a rock solid standing desk.