I have one just like the one you showed and I have been able to make it work acceptable, but if I had it to do over again I would spend a little more and get a decent MIG with gas.
The flux core splatters everywhere and is hard to weld a decent bead without leaving pin holes that you have to go back over and weld up, grind off, re-weld, grind off, you get the picture.
You can look in my Photobucket pictures, especially under the Roof Replace album, and see what I have done with a flux core.
