I looked at RS but didn't really like the style. I settled on Pimsler and liked it much better, although I was studying Japanese which is not much like Spanish. I think it comes down to what type of learner you are. Some are visual learners, some audio and some kinesthetic (pulling out my OLD teacher training from decades ago.) I do better listening and speaking. Others do better seeing something and plugging that into the lesson. Whatever works. For me that was Pimsleur.