You don't buy them for when they work. You buy them for when it goes wrong. At that point EMC type firms will throw engineers at the problem and provide plenty of relationship managers to help you keep your job (sorry, assist in ensuring that your business relationship continues to be mutually beneficial).
I've been on hours-long support calls with EMC and they acted like every other vendor in the world blaming your month-old firmware and deny deny deny and then "oh my shift is up", so whatever works for you if you want to throw money away.
