Is faster at downloading from mirrors.
Uses much less memory and a little less CPU.
Can download almost all files (source files, Packages.bz2, etc…) from peers, not just .deb packages.
Works with only the information apt has, no need for other files.
Doesn’t require a new apt transport for communicating with apt.
Is more modular and easier to understand as it is based on existing technologies (e.g. twisted).