I subscribe to the Ecos Heft now for over a year and have to say my Spanish skills have really improved. There is something for everyone, from beginners to professionals. It contains a good mix of short and longer texts on current topics related to the Spanish-speaking countries. I especially like the part "Idioma", which deals with grammar, idioms and translations. I can also the related issue "Ecos Plus", which provides more in-depth tests and exercises, highly recommend.