Understanding the fine print on 'raging bull' no deposit bonuses?

I'm looking at a few different sites offering a 'raging bull' no deposit welcome bonus, and I'm completely overwhelmed by the terms and conditions. Does anyone here have experience with these types of promotions? Specifically, I'm worried about the wagering requirements and if the bonus funds can really be withdrawn after meeting the minimum play. I read about a high turnover rate requirement on one site, and I'm not sure if that's even possible for a beginner. Any advice on which bonus is genuinely worth the effort, or if I should just stick to playing with my own cash?