applications on a physical device. In September 2012, a second developer prototype was released in September 2012, known as the Dev Alpha B. It includes a faster processor and a number of internal improvements. A third developer device, the Dev Alpha C, was announced on November 29, 2012, and is the first developer prototype to demonstrate the physical keyboard capabilities of BlackBerry 10. Acquisition of a Dev Alpha C device is based around a point system, meaning that developers who have previously developed apps for BlackBerry, or have had the Dev Alpha A/B devices, will have a higher chance of receiving a device than a new BlackBerry developer. It was released at the BlackBerry Jam Europe 2013 event in February 2013. Portathons Pre-launch "Portathons" held by BlackBerry have received up to 19,000 applications submitted per weekend. Reception Reviews of BlackBerry 10 have been generally positive. David Pogue of The New York Times noted that the software was, "simple to master, elegantly designed and surprisingly complete. It offers features nobody else offers, some tailored to the corporate world that raised BlackBerry aloft in its glory days." Walt Mossberg of The Wall Street Journal'' referred to the operating system as "logical and generally easy to use". Mossberg praised the virtual keyboard, camera software, and messaging hub; but criticized its application ecosystem, cloud capabilities and the immaturity of some features. Gizmodo's Kyle Wagner states that BlackBerry 10's home screen "gives BB10 the single best implementation of multitasking of any mobile OS right now". Wagner goes on to say that the Hub "works out to function a bit more like a junk drawer". He also reports what he refers to as the "Tragic Flaw": "Unlike every other major OS right now, BlackBerry does not feel fully integrated.". Wagner's review was based on the BB 10.0 and since the initial reviews of BB10 the OS has been updated several times and for many the issues have been addressed. In comparison to that, at launch, CrackBerry.com views the new features more positively and takes into account the fact that the OS is brand new. It says that the BlackBerry Hub "is a polished solution to efficiently managing the influx of messages we have coming at us...". It goes on to mention minor discrepancies and finally pointing out that many of the problems are getting fixed in future updates (some now released, e.g. battery life improvements, call