I am not a lawyer, but:
Given the recent trend of corporations trying to force you to give up your legal rights, I strongly advise everyone here to check their local laws and see if this sort of forced arbitration is even legal where they live.
Just for the sake of example I'll translate an excerpt of the local (Brazilian) Customers' Defence Code, from 1990:
Section II. On abusive clauses.
Article 51. Contractual clauses referring to the supply of goods and services are void of full right (i.e. non-enforceable), when: [...]
subsection VII - they determine the compulsory usage of arbitration.
I bet that most people around the world have similar laws protecting them. Use them or you'll lose them.