Cycles is being aggressively developed by the Blender Foundation and positioned as the future of rendering with Blender. The ray-tracing engine supports both CPU and GPU rendering, and since its release under the Apache 2.0 license, it has been also integrated in Poser and Rhino.
As with any offline rendering engine, high-quality and VR renders can take a long time to complete, even on the latest generation hardware. This fully applies to Cycles as well, especially for complex projects that use CPU-intensive functions (OSL, volumetrics, simulations). For commercial projects and in some cases even for enthusiast ones, rendering on a single workstation can be a very time-consuming process.
RenderStreet's technology will have your renders distributed over hundreds of CPU and GPU servers with just a click of a button. With this level of resources at your disposal, animations that took weeks to render can be delivered in just a few hours. Huge image renders can be delivered safely and fast. And you can be sure to make your deadline worry-free and without having to do any overnight rendering.
RenderStreet has full support for Cycles rendering and is the most user-recommended Cycles render farm.
See the available rendering plans for Blender/Cycles.