This is so true. In moab, one of our robotic rubis blew an oring on the way to moab, so he was out an entire day while he searched hi and lo for a new oring. Its neat to see these things in action when they work, but there are a million and one variables that can go wrong, with just one shutting down the whole system. Not for me, but hey, if you have tons of cash laying around like the guys I know with them... why not?