They're cute, they're compact and they fit in some places that a tower will not.
The drawback is very little inside space.
As you can see here there is only one exterior drive available in this case and it's for a DVD/CD drive.
If your needs and available space for a computer is limited this may be the case for you.
This view will give you a better idea just how small this case is.
You'll notice that the power supply area is very small compared to upright desktops.
and there's just enough room for the motherboard shield in the back and that's it.
This case comes with a 150 watt power supply. Barely adequate except for the minimum of business machines.
That's very small compared to today's computer power needs.
Even with just a motherboard, hard drive and a DVD/CD drive this case will be crammed.