[dragandj]

The language and basic platform is not a problem. OpenCL was and is OK. However, the libraries are far and between. CUDA offers cuBLAS, cuFFT, cuDNN, cuSolve, etc. For OpenCL, even the decent BLAS library (CLBlast) had to be written by a guy who did it for free, while AMD's clBLAS is more or less stalled (and I never managed to build it on Linux in the first place), and that's it...

[ryanpepper]

The ability just to swap in the cuFFTW header for FFTW3's making calls execute on GPU (even though it doesn't give the best performance) is also nice for beginners.