Hi Everyone,
The feature set between v1.5.3 and v1.5.4 are identical.
v.1.5.4 includes support an internal component change. Same spec, and quality, just a different source/vendor which required a firmware update at the factory level. The newer production SC5000/M may also ship with this version until 1.6.0 is final. The next public feature release will be v1.6.0.