I have owned my current truck now for a couple of months, and thus far I have to admit the DEF and DPF are not the big scary monsters many want you to believe... Prior to buying this truck, I specifically avoided emissions systems like the plague, but they have really come along way the last few years, and the systems so far have been a huge non-issue.
And, if some day after the warranty expires, it proves to be an issue, it can always rust and fall off the truck going down the road later.
As a side note... I rode with a buddy of mine this weekend in an LBZ Duramax.... He has the 5 position EFI Live tune on it... Good Lord, on setting 5 that motor is an absolute scary fire breathing monster!