I have three Daniel Defense AR's. 16" lightweight model, Mk18 and PDW in 300 blackout. All three are shot suppressed.
I did have an issue with the 300 blackout caused by my laziness in cleaning, so it was very dirty. The issue was found by Daniel defense to be the trigger I installed, a cassette type unit that was very gunked up. I changed to a geissele and no further problems, but the warranty situation was some of the best customer service I have ever had. They were responsive and called me several times during the process letting me know what was going on. I even suggested that I should pay for the service since it was my fault and they said absolutely not. I'm happy with the Daniel Defense warranty department and their customer service, my other two have run flawlessly, although I do clean them a bit more often now.
Another thing to keep in mind on higher tier guns is they have always seemed to retain more value in the long run, which is important to me, as I have a tendency to impulse purchase shiny objects and then end up with more than I can use or store.