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In a recent article by Benson et al., 2011, the authors show the latestmeasurements from the South Pole Telescope (SPT) Sunyaev Zel'dovich (SZ)cluster survey to better constrain some cosmological parameters. In particular,the authors found that adding the SPT cluster data significantly improves theconstraints on equation of state of dark energy, w, beyond those found whenusing measurements of the CMB, supernovae, BAO and the Hubble constant. Themain aim of the present research note is to give a further quantitativeestimation of the above better constraints, through the computation of theFigure of Merit (FoM) applied to \Omega_m and w plots for the 68% and 95%confidence regions. This allows a better evaluation and a better comparison ofthe continuous improvements on the cosmological constraints, obtained using newdifferent cosmological probes and different surveys.

On the better constraints from the South Pole Telescope  Sunyaev-Zel'dovich galaxy clusters survey: a FoM evaluation for the equation  of state of Dark Energy