  While the pronounced doping dependence of the quasiparticle spectral weight
in the antinodal region of the superconducting cuprates, as seen by ARPES,
unambiguously points to the magnetic origin of the strong electron-boson
coupling there, the nature of the electron scattering in the nodal direction
remained unclear. Here we present a short review of our recent detailed
investigations of the nodal direction of Bi-2212. Our findings prove the
existence of well defined quasiparticles even in the pseudogap state and show
that the essential part of the quasiparticle scattering rate, which appears on
top of Auger-like electron-electron interaction, also implies a magnetic
origin.
