I've actually used it a lot. Some more work is required, but the
speedup is very impressive.
About two years ago I compared a proprietary solution claiming to be
very fast to ECJ + Cuda in terms of speed.
Without much optimization and with a stock GTX295 GPU, ECJ was nearly
two magnitudes faster. The way GPUs
are moving, the difference is probably even greater today.

2011/6/25 Sean Luke <[log in to unmask]>:
> David, there's actually an existing CUDA project which uses ECJ.  Check out:
>        http://www-lil.univ-littoral.fr/~robillia/GPUregression.html
> Sean
> On Jun 24, 2011, at 3:24 PM, David vun Kannon wrote:
>> Hi Sean,
>> Any thoughts on how ECJ could be used to take advantage of GPGPu
>> architectures such as Nvidia's CUDA?
>> Thanks,
>> David vun Kannon