I owe an OROZCO 15U, and though I am selling it, I HAD TO try Aranjuez strings, which have been designed by Juan Orozco himself. My opinion is so-so... Because my guitar is a concert guitar and I use it when playing with other instruments (flutes, violins) I chose high-tension strings. So I went for A600 (Classic Gold). I would say: yes they sound well (rich tone for the trebles, warm tone for the basses), and they deliver power, BUT they do not last long. I will try now the A400 (Concert silver), which are slightly more expensive; the ad says "for the guitars of today"! At Strings and Beyond, you can find also the low tension (A700) and medium tension (A300) sets.