I bought something similar about 18months ago. 2 speaker surround, with sub-woofer for €30 or something like that.
It does the job satisfactorily. Gives more ooompf to the sound. You're not going to get perfection from it, but for a 2nd tv, or kids tv, it's fine. Great for sports coverage on the tv as well.
One thing though. The cable lengths on the 2 speakers were very short - wouldn't extend beyond the top of the tv. So from that perspective, not really surround-sound.