I got two but I don't use the other cause the [space it occupies : usefulness] ratio isn't good enough. I only got a 1 meter wide desk and where the current screen isn't, theres speakers.
I also had the issue with desk space. I opted to sit my spare monitor up on the shelf next to me instead. Not ideal, but it retains practicality and keeps it out of the way. I'm accustomed to using it if I need to multi task.