An inverter at an affordable price
This inverter does the job. It's the second one I've got, the first has been working for 6 or 7 years without any problems.
The only criticism is that it doesn't communicate, i.e. it warns you when the power is cut, takes over when you save and shut down the computer, but it doesn't do this itself. So it's not a good idea if you're in the (very bad) habit (or need to be, NAS server for example) of leaving your PC running. For the rest, it's great.
After that, it's already very good for the price.