The Surface Pro 3 is arguably doing well. In fact, Microsoft posted $1.1 billion in revenue from their Surface line, which is a 24% increase over the previous quarter. Although that number by comparison is not staggering, it does demonstrate that the Surface, as a product line, has some interest.
Windows RT and the Surface 2, though, are not fairing so well. Microsoft today confirmed with Business Insider that the laptop-esque device is no longer being manufactured, although you can still pick one up from Microsoft Stores and retailers while supplies last.
Murmurings of such a cancellation started back in October when ZDNet's Mary Jo Foley reported that Microsoft was finished with ARM-based Surface tablets.