I read the nVidia GPU Computing forums quite often, so I'm happy to see GPGPU programming spreading around more; in fact, I'm planning to submit an application to YC soon for a new GPGPU product I've been working on.

How does GPUmat compare (performance- and feature-wise) to the commercial Accelereyes "Jacket" product for Matlab? I'm not promoting one or the other...just curious to know!