Continued updates beyond what was available 15 years ago (when BB 1 & 2 were released).
The changelog is publicly available:
http://amigan.1emu.net/releases/BoingBags3&4.readme
* Large hard disk support, LBA48 support, extending the possible disk sizes to 128 petabytes (131,072 terabytes).
* A more robust and faster TCP/IP stack
* New video drivers for wide screen monitor support and enhanced graphic modes
* A fully working web browser
* Huge amount of bugfixes that improve system stability and behaviour
* Impressive update of system components, adding a lot of new features
* And much more... (For more details please see the changelog.)
.... I don't see anything that is a deal winner to be honest. Other than the following but I don't know what it means :-(:
Impressive update of system components, adding a lot of new features