As a lurker, I'd hate to make my first post about a complaint, but I have owned a DDM4v5 LW since about December of 2013 which was bought new straight from DD shipped to the store I work at, and I have to say, it is not all that great.
I only owned one other AR before this, a spikes tactical, which I sold to buy the DD.
The DD trigger is a standard GI trigger with a horrid pull. Although it doesn't matter and is purely aesthetic, the bolt carrier group on the spikes was machined more smooth. Also, the castle nut staking on the spikes was done neatly on every groove, whereas the DD barely had any staking. It was done improperly and very sloppy, as if they didn't even use a center punch and were drunk on the job.
The gun was also from a period where DD cranked out a large batch of out of spec lowers. The pistol grip screw hole was off center, and the factory DD A2 grip screw hole was wider to accommodate the out of spec lower, and the detent spring hole on the factory A2 grip was flared open with wider tolerances. The aftermarket TangoDown grip wouldn't fully scew on to the gun as a result.
I called them around a week after SHOT show, and they told me their customer service lady had called in sick, and that she would call me the next day. The man on the phone mentioned that he had heard complaints of Magpul grips not fitting.
The next day I got no call, so I called them back the day after I was supposed to get the call and they told me they were busy because of SHOT, which was already over by then, and that they either told me that they'd contact me for the warranty exchange in a few days or that I should call back after another few days. I can't recall.
About 9 days of runaround later, I finally got my shipping label only after I bypassed the guys on the phone and emailed a higher up, Joe Marler. He is the one who finally got the customer service lady to contact me. Mind you, Springfield armory has gotten me my warranty repaired 1911 back to my door within 8 days of me first calling them and shipping the gun that same day on their dime.
Although DD eventually made it right, I have heard from and read about many others on forums who had the same problem as me, and seeing as to how the rep on the phone knew that there were complaints, I feel like they may have purposely sent out an out of spec batch that someone screwed up on to save costs.
I honestly don't see DD as special anymore and wouldn't buy another one. I'll stick to other mil spec makers, like colt, BCM, FN, or build my own or such.
Rifle in question.