I think they should add these at their ad :
- Much-much higher source/sink current capability than your ancestor's 555.
- Should you blew up the output transistors, you could easily replace it with beefier one with lower Vce sat version rather than have to replace the whole IC. Think green.
- Improve accuracy ? No big deal, just replace the 3 voltage divider resistors with higher precision & lower temp co version, you will have an "elite" version of 555.