I've found them to be a good CD retailer, as far as pricing and selection goes. Even if a title is on backorder, they usually can get it in and ship it out to you within a week or so. The free shipping offer is similar to DDD, in that it takes from a week to two weeks to reach you once it's been shipped. From my personal experience, customer service has been top notch as well. Whenever I've had a question concerning an order, someone has always been there and willing to help me out.
I actually had to price match something a few months back and not only did they go lower than the other etailer's advertised price, they went two bucks lower, down to around 9 dollars shipped for that particular item. Very cool.
So, if you're satisfied with the service you get from DDD, I'd definitely recommend checking out DDCD.
I have used them. For the most part, they have offered the lowest prices and good service compared to other online retailers. I did have a mix-up when I cancelled part of an order, but they shipped the complete order. They gladly paid for return shipping and I would have no reservations about ordering from them again.
I have also very often used DD DVD with only one problem that was corrected asap. Order either got lost in the mail or just wasn't shipped. When I contacted them about the missing order they shipped a replacement immediately. Good customer service on this one, so really no problem.
Fast Forward to my first order with DD CD early this year. I ordered 2 SACDs, but they sent regular red-book cds. I contacted them about the mistake, & after months of trying to get them to straighten it out - first with simple correcting their mistake by sending the correct items, & later by just giving me a refund. I am supposed to have a credit on my CC (waiting for this months statement to verify). We are talking at least 3 months here. I was very surprised, & disappointed in their (lack of) customer service on this order.
I would expect this is the same company as DD DVD, even asked them so, but could never get a answer out of them. Again I had no problems with DD DVD, but feel the CD dept is a bunch of boneheads. I doubt I will ever order from DD CD again, & have 2nd thoughts about using DD DVD ever again as well. I have not ordered from them since.