Great engine!
The only semi-common failure I know of is the occasional cracked exhaust manifold - but it's not too expensive to replace.
They tend to run great right up to around 750000 miles where they may experience oil leakage from the head gasket (but still run fine). Most people do an "in-frame" rebuild at that point since they're so far into it.
Yep, like its little brother, this is a great engine.