  Laser-based electron acceleration is attracting strong interest from the
conventional accelerator community due to its outstanding characteristics in
terms of high initial energy, low emittance and high beam current.
Unfortunately, such beams are currently not comparable to those of conventional
accelerators, limiting their use for the manifold applications that a
traditional accelerator can have. Besides working on the plasma source itself,
a promising approach to shape the laser-generated beams is coupling them with
conventional accelerator elements in order to benefit from both, a versatile
electron source and a controllable beam.
  In this paper we show that some parameters commonly used by the particle
accelerator community must be reconsidered when dealing with laser-plasma
beams. Starting from the parameters of laser-generated electrons which can be
obtained nowadays by conventional multi hundred TW laser systems, we compare
different conventional magnetic lattices able to capture and transport those
GeV electrons. From this comparison we highlight some important limit of the
state-of-the-art plasma generated electrons with respect to conventional
accelerator ones. Eventually we discuss an application of such beams in
undulators for Free Electron Lasers (FELs), which is one of the most demanding
applications in terms of beam quality.
