My DILE had numerous issues:
A light board was installed off the marked screw holes by almost a full cm. Could barely see the leds from above the pf. Had to rescrew the board day one.
Bob lights wired incorrectly.
Trap door flap broken first week
Phone went black repeatedly. Replaced 3 times. Long process.
Playfield seating design issue on all games.
Backglass lock jams. Common issue.
Different CPUs in games. Early adopters get slower cpu which causes video issues for some (me included).
Bluetooth app support abandoned. Many don't care, but I liked and used this feature.
Code for multiballs and b.o.b. targets needs improving, but they won't do it.
All that being said, the phone and it's characters are the best integration of a second screen in all of pinball. The camera integration was new and is still awesome. It's one of Pat's best layouts. Build quality, aside from trouble spots, is great. It isn't cheap, like stern.
Stern offers a more robust machine, but they don't offer innovation. I don't know if I'd buy nib from either at this point. I just picked up a doctor who, and the shots are 10x more satisfying than anything in gnr....