I really enjoy mine - love that big thumb button. And Aspire has offered two firmware updates with new features and the option of a screen menu system versus the key combination method of operation.
I did have an annoying problem with mine for a few months: the plastic switch on the battery door stopped sitting flush with the base of the mod so the device would sit tilted when resting on a flat surface. Luckily, it corrected itself eventually and has been working fine for months now.