I must say that I am very disappointed. I bought the software a few weeks ago based on its ability to transcode to HD using CUDA. The software advertises CUDA and yet it is clear that the company is aware that it only works with outdated Nvidia cards.
I was asked after I bought it what I thought of it and I expressed my concern that it is being sold as current software when it is clearly not. It takes hours to convert anything despite fast processor and 770i GPU. I didn't expect a reply and that is what I got.
I liked the fact that it can covert my 3d blurays to Side by Side to put on my server but it is totally impractical at 2 or three hours per BD. BTW I understand that using older drivers does not fix the problem as the newer GPUs don't have the correct CUDA hardware.
There is lots of conversion software out there so if CUDA is important to you buy one where the users say it works.