Excellent product, as expected.
However, while it's nice that jonbluestone is trying to alert the world to The Great Storage Conspiracy of 2011, not only is this not Play's fault but it's also not an issue as pretty much all storage devices marketed today have their sizes advertised in this manner.
When marketing a product the SI units KB, MB, GB, etc are used. This means that 1KB is considered to be 1000 bytes, however, computers treat 1KB as 1024 bytes (the unit in this case is actually KiB), and so the actual size is lower than what's claimed. This is technically not a lie, albeit incredibly annoying, but then again, when are marketing tactics not annoying?
Furthermore, if you look at the Technical Specification of the product it even says "Formatted capacity (30GB)".