Never been but have driven near it on the Rio Grande highway. The drive between Terlingua and Presidio is breathtakingly beautiful. The mountains on the Mexican side rise straight up from the Rio Grande '4000 feet above your car window. You have to see it to appreciate it. The Texas side is rugged to, but not like the Mexican side. But heck yeah it's worth the drive because, well, why not? If it sucks, which I doubt it will, it doesn't matter. You saw a part of Texas you hadnt seen before.