This particular rack is nice because it allows you to have access behind all the devices. It also has a workstation to work on and a air conditioner to keep everything cool including me.
This one is ok that is in a small closet. There is not a lot of space behind the devices, has a small pull out workstation and does not have a air conditioner. Therefore, they need to keep the door open during the day to keep from getting too warm. This, of course, is not as secure.