Hardly, for the earlier challenges I managed to hit ~50 a second with native code on a core i7. Missed out on winning any of the smaller challenges though though.

I don't think it's worth my time unless I managed to find enough hardware to do at least 100k attempts a second. Scrypt is executed on the CPU and the PBKDF runs on the GPU, then the GPU sits around and waits for the CPU to get it's job done before XORing the results. I considered making a pool, but there's no way of knowing if people are being truthful when submitting solutions.

It's a pity scrypt is designed to be hard to implement on hardware, or I'd have a crack at it with some FPGAs.