I have had my RAID 0 with two Titan 128s running for almost a week now.
I can say, as others have before me, that this is the single best upgrade that I have made in years. Loading of everything from windows 7 through flt. sim. are faster than I have ever experienced. I get a file transfer rate approaching 400 mb/sec.
Everything feels snappier and smoother. I couldn't be happier