Being the free PlayMyQ version, this is a no-brainer: just download it now and enjoy. Period. [plus, having the free client handy is useful in case you wind up at a gathering where the host is serving music in Player mode, so you can send requests.]
The only thing to "think" about is whether to upgrade to the HD version or not. While i did upgrade, and i certainly recommend that others do as well... i believe after a few minutes of using this app, the user will come to the same decision on their own.