The A510 has only been available since sometime in April but it seems now shipment has already been stopped. Not because it wasn’t selling well or because Acer wanted to discontinue it but because of an issue with the hardware. Acer made no comment about the hardware issue but on Amazon the page to but the tablet says Under Review and No Longer Shipping.
Some of the comments on Amazon has led to believe it is a serious issue that is causing the tablet to freeze up a lot. The tablet should no be freezing because of that powerful Tegra 3 on the inside. On the Acer Facebook Germany page they had this to say:
Dear Fans, Please find attached an important update regarding the delay in delivery of our A510/A511 Tablets: Due to a faulty component is an important component, it comes with our A510 and A511 Iconia Tabs unfortunately delays. The Acer quality control is very strict with any product to the legitimate demands of our customers – you – to do justice. It affects the Iconia Tab A51x series. The Iconia Tab A700 will be available in the latest week 24th Thank you for your understanding, your Acer Germany team
You can still get the tablet from 3rd party retailers but I do not recommend that unless you want a faulty tablet.