How are turbo 4s holding up in SUVs?

I'm going to be in the market for a new or recently used midsized (3 row or larger two row).

How are the turbo 4s being put into cars like the Explorer and CX-9 holding up? It would seem logical that the larger V6 motors would last longer, since the smaller, force fed 4s are working so hard to make power.

What is the real world experience with these small but mighty 4s?