I finally swore off DDD after about two years of randomly damaged items. They always stood behind their items, but by the time I paid return shipping and the delay waiting for a replacement, I was better off going with a company that actually puts their DVDs in protective packaging as opposed to throwing them in a box. BestPrices.com and Amazon.com (direct, not marketplace) both are excellent when it comes to shipping quality.
It should be noted that I am:
A) Picky as hell when it comes to box quality, especially when it's a box set or other form of cardboard boxing
B) Likely to order $200-$300 at a time, and thus have large orders. I've never been disappointed in DDD when I've done a one-off order. They've got a great single-DVD packaging. It's just their large box packaging that sucks.