I've used Genuine Fractals for about 15-years (give or take). Generally, I've been happy with the program. The latest version, I have to say, stinks. In a nutshell, everything takes longer than GF6. On the average, everything on my system takes about 8-10 seconds to render - whether it's turning sharpening on or off to see the effect, or changing viewing magnification from 1:2 to 1:1, or scrolling to another section to view. At first I thought it was my system. Apparently, they've gone to OpenGL for onscreen rendering from whatever was used before. I replaced my video card (for other reasons as well) to one of the newest, an nVidia GTX 560 Ti, no real effect. There was also virtually no difference between 32-bit and 64-bit Photoshop. Then I thought it might be some sort of incompatability with my AMD Phenom II x4 CPU, so I tried it on my Sony notebook which has an i7 mobile chip. Wow, that took almost double the time to do any given action. The final test was resizing a 1Ds III 8-bit file, enlarging it to 170%. It took PR7 about a minute, whereas GF6 took about about 30-seconds -- and no visible difference in quality. (As a comparison, Alien Skin's Blow Up 2 took nearly a minute.)
If you have GF6, or maybe even GF5, save your money.
Nemo