The "Horizon" looks more interesting than the "Velo" - they seem very similar, except that the Velo comes with 16Gb internal memory (but no microSD card slot), whereas the "Horizon" comes with only 8Gb memory, but a microSD card slot (for up to 64Gb). Importantly, the Horizon also has a removable battery. Other than that they look identical, except that the Velo is white and the Horizon orange, and the Horizon is a few mm thicker (though looks much chunkier).
