I've been using V9 for four weeks now, processed over 100 images, and really like it. V6.2 worked fine on my old machine but I could not get further updates to work. That machine started dying so I got a refurbished Windows 7, 3.1 ghtz processor, 4 gigs RAM and a 1T HD. a very inexpenive computer that works good. V6 would just crash on the new machine but V9 is perfectly stable and runs at light speed compared to the older setup.
I've been with DXO since V3 or V4 and can't stand ACR or other processors.
and I had a few images we took inside a Kiva in Blanding, Utah where the light comes in only through an entrance hole in the roof. I had to set my old Canon 20D, a camera that is near 10 years old now, on ISO 1600 and underexposed to a certain extent to get the shots. PRIME just blows me away. It made those images look great even when I brought up details in deep shadows. Normally I don't go past ISO 800 on that camera. It took away the sensor patterns, all the other noise and kept an amazing amount of details. I used the standard High on the other images, all the noise is gone, all the fine detail remains. I no longer use Noiseware plugin. They have done some stellar work thoughout this entire version.