I have purchased the product in October 2011 and immediately used it as part of a PPT presentation. Both the trial runs, as well as the lecture itself, it has trouble-free work (all functions available). Used were: Netbook Acer Aspire One with Windows XP and MS-PowerPoint of 2010. The placement of the USB adapter in the battery compartment is awesome at first glance. Since the locking mechanism of the compartment consists of only one latch member (very thin plastic version) is a presumption that the hook might break with frequent use and the battery compartment is thus open. As I said, the idea is great - only the implementation is a bit cheap. One should accommodate the adapter, however, not be overestimated, because the importance of the function of the device. And that is not objectionable.
