  We study quantum states produced by optimal phase covariant quantum cloners.
We argue that cloned quantum superpositions are not macroscopic superpositions
in the spirit of Schr\"odinger's cat, despite their large particle number. This
is indicated by calculating several measures for macroscopic superpositions
from the literature, as well as by investigating the distinguishability of the
two superposed cloned states. The latter rapidly diminishes when considering
imperfect detectors or noisy states, and does not increase with the system
size. In contrast, we find that cloned quantum states themselves are
macroscopic, in the sense of both proposed measures and their usefulness in
quantum metrology with an optimal scaling in system size. We investigate the
applicability of cloned states for parameter estimation in the presence of
different kinds of noise.
