  Hyper-velocity stars (HVS) are enigmatic objects because they are travelling
so fast that they escape from the Galaxy. Among hot subdwarfs, only one such
star is known, the He-sdO US 708. The Hyper-MUCHFUSS collaboration provided
additional HVS candidates. Here we revisit the fastest candidates including US
708 by analysing optical spectra and spectral energy distributions using a new
grid of tailored model atmospheres and report preliminary results. The sample
is dominated by H-rich subdwarfs and their distribution in the Kiel diagram
appears to be bimodal for the sdB stars but otherwise fits canonical
evolutionary models well. Gaia proper motion measurements allowed a precise
kinematic investigation to be made. It turns out that all previously proposed
HVS candidates are actually bound to the Galaxy, except US 708. The original
candidate sample turns out to belong to an extreme halo population. The
scarcity of available observations of US 708 calls for space-based UV and IR
photometry as well as high precision radial velocity measurements.
