I bought this specifically for viewing Blu-ray titles on my VAIO laptop, and I have to say this is pretty much the only choice. But I am an experienced Windows user and write my own software in my spare time and I have to say that this is the most problematic program I have ever had to deal with. It reacts badly when Kaspersky starts up to download updates, and I have given up trying to run Firefox in the background as it freezes when there is any network activity. It quite frequently fails to launch successfully unless there is already a disk in the drive and always freezes when it is run by autoplay. I am using the latest version and combined with the slow update server (100 KBps or less) and 100MB+ binaries that take nearly ten minutes to install, this program is an absolute pain. But I am glad I have it, as Blu-ray disks look absolutely gorgeous and the DVD upscaling is beautiful. I would recommend this program to any experienced user, but I wouldn't recommend it unless you have an absolute need to view Blu-ray content. I really wonder why you'd need it for playing DVDs, considering that Microsoft Media Player 11 is free and handles DVDs, with RealPlayer another free alternative. The only positive benefit is the sharpness of the picture. MoovieLive (sic) is only partially successful, and I can't even be bothered to try the remix feature. If you want to organise your movie collection be warned that one fix for random freezes is to delete your thumbnails folder, so you could lose it all anyway. (Update: With the latest 'patch' No. 2320 (100MB) movies play without any sound. If you ask me this is a company that has lost control of its' development processes).
My System: VAIO VGN-FZ21M w/ Blu-ray, 2GHz Core 2 Duo, 4GB physical RAM, NVidia GeForce 8400M GT graphics card, 80GB free disk capacity, Windows Vista SP2.