I've been using and abusing this coupon since it hit...so far I've picked up (prices are after coupon and before tax):
6/21 (one transaction)
-Unknown (Blu-ray/DVD/DC Combo) - $17.99
-The Adjustment Bureau (Blu-ray/DVD/DC Combo) - $17.99
6/28 (one transaction)
-Sucker Punch (Blu-ray/DVD/DC Combo) - $17.99
-Barney's Version (Blu-ray/DVD Combo) - $24.99
-Warrior's Way (DVD) - $11.99 [I know...it's terrible, but I was curious to see for myself; planning to trade it in at a local MovieStop next week]
7/5 (one transaction)
-Hobo with a Shotgun (Blu-ray/DC Combo) - $12.99
-13 Assassins (Blu-ray/DC Combo) - $12.99
7/5 (later that day, after deciding to buy the following)
-Transformers: Headmasters - $14.96 [I took it to customer service and had her price match it with Wal-Mart. I'm a regular, especially with price matching, so she took my word and didn't check - Wal-Mart's price was actually about 10 cents cheaper than what I told her, but I'm not sweating over paying the dime. She didn't even second-guess the coupon, took it right away and made it $5 cheaper]
I believe I also picked up The Legend of Chen Zhen (DVD Collector's Edition), but I don't seem to have my receipt nearby...not sure if I bought it there or not (I usually gauge prices between Wal-Mart, MovieStop, Best Buy, and Amazon, and then make my purchases accordingly).
The only time I even had a hassle was when using three in one transaction on 6/28. I went through a different cashier than the one that rang me up on 6/21 just as a precaution, and I'm guessing this one was fairly new, so she was saying she was pretty sure I couldn't do it. I was polite, asked to her to try, and the cashier who rang me up on 6/21 asked her what was wrong, and when she explained that I had 3 coupons, the 6/21 cashier told her it was alright and rang me through.
Looking to pick up Insidious, The Lincoln Lawyer, and Rango next week with more coupons ready. I'm sure they'll be carrying [REC] 2 (it's finally coming out, everyone!!), but I have it pre-ordered at MovieStop, and I have a few subpar flicks to trade in towards it...plus there's Uncle Boonme Who Can Recall His Past Lives (won the Palm d'Or at Cannes) coming out, but right now Best Buy is listing the DVD for $24.99...and I'm not so sure they'll carry it in stores anyways...