Agreed. I carry the small version of the Rewards card on my keychain, so it's always handy when I need to present it. I've also used the same coupon more than once without any problems, but perhaps they're starting to crack down on that.
I used the 40% off coupon plus $5 in Borders Bucks I'd accrued to pick up the first Jazz Icons box set yesterday for about $20 cheaper than I could've gotten it for online. Granted, that's an unusual occurrence, but you can come pretty close to equaling online prices if you use the 25% and 30% off coupons. I rarely bother with the 20% off ones anymore unless I use one to pick up a single CD.
I agree with both of the above.