Noiseware is pretty darn awesome.
Since getting the Canon G9, I've experimented more with noise reduction than ever before. I've used Neat Image in the past but based on some studies by Thomas Niemann found that ACR noise reduction was somewhat better. With either of these methods, it seems to me that I can get an acceptable 8x10 print from the G9 at ISO400.
ISO800 is a different matter.
Interested by the comments on this thread, I've compared Noiseware and Noise Ninja to Neat Image and ACR. To compare, I used all four noise reduction methods and overlaid them in Photoshop. Neat Image, Noiseware and Noise Ninja were profiled automatically. Comparison was at 50% magnification. I turned various layers on and off and examined light and dark areas. I compared ISO800 shots in good and poor light.
It seems to me that Noiseware is the best package for my needs (Canon G9); Neat Image had the poorest performance -- usually creates unsightly artifacts even if the strength is turned down to 50%. Interestingly, of these packages, I am the most experienced with Neat Image although that experience must not translate into expertise.
Anyway, I think I'll be buying Noiseware. It did not *always* produce the best noise reduction but then I haven't read the instructions yet either.
Oh yes, I can now sometimes get a decent 8x10 from G9 ISO800!