I have a Dmax LSU, it's the first 4x4 we have owned.
We had a few dramas with the dealer regarding delivery and I complained to Isuzu Ute Australia about it. they intervened and got things sorted out the same day and I was told by a salesman that IUA had launched an internal enquiry about it all and that the manager was now just a salesman.
I have also been in contact with IUA about a few things regarding the Dmax (nothing negative) and they have been extremely helpful.
I did a lot of research before buying the Dmax and while I could find a lot of negatives for the others, I was hard pressed to find any for the Dmax.