As a person who has never heard of winx club until this came, so here treating it is an independent series, it is actually quite good. The character development and depth is there, nice storyline. You should totally give this a try. Then again, I have heard, that in regards to its relation with the winx club, its garbage. So before watching this, you should take in account whether or not you'll get bothered by the dissimilarity between the source and the series.