Text: Although your journey is going to be difficult and at times you will doubt yourselves, the benefits to clients are well worth it and the satisfaction of hearing even the most recalcitrant of adversaries say that the new system is better than the one that went before is deeply rewarding.
Entailment: It is rewarding to hear that clients like the new system.
Contradiction: Your journey is going to be difficult and complex and by Friday afternoon you'll hate yourself; its's not worth it.