That's honestly not that great at all - you save 20%, but in exchange your ticket is non-refundable and you can't upgrade to a sleeper (and the discount is not stackable). If I were booking for that time period, I'd probably opt for full fare even if traveling coach (I'd at least want the possibility of an on-board upgrade, not to mention the refundable ticket). If you use AAA, NARP, senior discount or the like you get at least 10% off anyway - and without the strings attached. Now, if it were 50% off it might be worth it...