Anyone tried this stuff?  Is it worth the extra compared to normal white emulsion?

We've got a ceiling that was plastered without any kind of reinforcing over the joins in the plasterboard, and I've tried various fillers but they keep coming back.  They're really fine cracks and so need taking out to get filler into them which is more hassle than I can be bothered with

Kinda hoping for a miracle paint that will hide the cracks. Permanently