YES! Happy to do so.
I have been using DX10 now for about 2 months. I found things rather straight forward setting up DX10 using Steve's Fixer and Paul's Guide. I simply cannot say enough how worth it the move was to using the DX10 Preview.
What I noticed right from the start was the smoothness. I knew after reading up on the procedure for setting up DX10 correctly, I was not going to see a boost in frames. I was interested just to see if the experience would be better.
Well? It's kinda like this. A bad day out on the boat fishn is better than the best day at the office.
In other words. DX10 I found, was so much smoother that even though FSX frame counter was showing at times 14 - 15 fps, I didn't really notice it. I was pretty much set from that point on.
Using Paul's guide, and his advice for testing, has helped me to achieve a nice, stable, smooth, 24-25 fps. That's right. My FPS no longer jump all over the place. It is kind of odd at first to see that. You think something's broke. The only time they may drop is near water, cars, high dense airports, traffic etc.
I would not be hesitant to try DX10 even if you are like me and have an aging machine. You simply have to invest a little time to understand the process, go for it, then make adjustments, enjoy.