ROFL - I've been using one of these for years! I found it on closeout at Staple's about 15 years ago and have been looking for another since so I could leave it at the vacation home. If it is like mine, the keyboard shelf height is adjustable and can accommodate different machines.
Two downsides. One, the table is made from laminated MFD and will develop a sag over time. I also had to reinforce the bolts on the keyboard shelf. The other is that although it folds up, it is awkward and a bit heavy. It's great for my permanent home use, but I wold take it to workshops.