It looks like they all work great.
While they they all 'work' the diesel has a distinct advantage. They idled up stuff, the others had to rev up to get over. Also mileage was a pretty big difference. OOn the while you're probably looking at an inscrease of 100-150 miles.
I think if they can make it cost as much as a 5.3 swap, a lot of people will consider it. A 5.3L swap is around $18K out the door. For those who are only 49-State Legal, it might not mean much but for those of us in California, it means a lot.