Well it's free to try (if you got the HW that is).
It's fast enough to run UAE at full speed without having to tune down emulation-details.
It has the best and most compatible webbrowser of all Amigaoid OSes.
It has Ambient, the most advanced Workbench(replacement) of all Amigaoid OSes.
It has Poseidon the definite benchmark for all things USB in Amiga-land.
3D-support is also unrivaled.
68k WarpOS and PowerUP emus (for older systemfriendly apps) is a winner in speed compability and stability.
MUI4 is every Amigas-Devs wet dream (o.k. I might be a bit over the top with that one
).
Printing is done via TurboPrint, unrivaled in quality if you got a supported printer (something that understands either PCL or PostScript should do the trick).
Plenty more, but it's 6 o'clock right here.