Release 5.4 vs. 5.3

Does anyone see a compelling reason to upgrade from 5.3 to 5.4 ?
I only saw the captions of the changes, but I was wondering if there were some other goodies like bug fixes incorporated as well ?
IOW is 5.4 more stable than 5.3 ?

From the captions, I didn't see anything special except maybe the Analyzer APIs and these Spark Applications.