  In a recent paper \cite{Radu}, Radu \textit{et al.} report experimental
results they claim to support Bose-Einstein condensation (BEC) of magnons in
Cs$_2$CuCl$_4$. It is true that an experimentally measured critical power law
scaling exponent in agreement with the BEC universality class would support the
realization of a BEC in magnetic systems that order as a canted
antiferromagnet. It can be shown, however, that the claim of Radu {\it et al.}
is overstated in this instance, because their determination of the critical
exponent $\phi$ relies on a model-dependent theoretical approximation to the
critical field $H_{\textrm{c1}}$ for which the associated errors are neglected.
We show that when these errors are included, the uncertainty in the obtained
exponent is so large that the available experimental data cannot be used to
differentiate between contending universality classes.
