I think the problem occurs with pretty much all GM V6 and V8 engines made between certain dates- not sure of the time frame. However, the problem is far from universal, and I believe it has to due with Dexcool being exposed to air from leaks and/or failure to change the coolant frequently enough. The coolant then attacks the gaskets.
This vehicle is new enough to be a pretty safe bet as long as the cooling system is intact and proper maintenance has been done (as with any other used car, of course).