Hi, I had this combo cacti abused (uncared) for years and this summer when I started growing houseplants I found it near dead. In another forum here, some pointed out it's dead and some suggested to look at their roots see if intact... So I pulled them out, checked their not much alive roots, threw one (with roots gone) away, and re-potted it put under summer sun... Now I am still not sure if it actually survived (I do see them grow a lot more 'hair' though). Let you guys give the verdict:
9-14-2014 (near dead)
9-26-14
Today