What a perfectly horrible deal. The GOP gets nothing except 3 judges in exchange for agreeing to take the nuclear option off the table for the balance of this Senate term. That means it cannot be used for a SCOTUS nominee to replace Reinquist or otherwise for this term. Moreover, the agreement that filibusters should not be used except rarely, does not commit anyone to vote for cloture if it is not used rarely, just that they will not filibuster.
As I said, this is a horrid deal.