Do ClassDAudio Amps Have Proper Decay Of Notes?

Dont rule out the importance of the amplifier as well as associated componemts as others have mentioned. I have been using Class D amps for.some.time now as the heart of our hybrid amps. In a system, everything matters. I prefer tubes in front of them. If not a preamp then a good tube buffer makes a big difference. Just be careful of the type of load you put on the ClassDaudio amps and stay away from plannars.
Other than that, i am very happy with Class D which is why i chose to use them in some of our products. The Class D Audio products are exceptional for the money.

Thanks for your input gentlemen, sorry I haven't replied for so long, I haven't been on this site. Just to clarify, I absolutely don't discount that the power amp is crucial to the sound. My throwaway comment was more to do with how insanely expensive they are compared to other components when you're on a budget, and don't alter the sound as much as a line stage or cartridge. But yeah, crucial.
Atmasphere, my speakers are an easy 8 ohm load @ 90db. They sound great with my current 3.5w tube power amp, but I listen to so much alt rock that I miss the filled out bass I had with my previous solid state monster, which I only got rid of because it went out to 200khz and I had oscillation problems with my preamp. The ClassDAudio goes out to 35khz, do you think this is far enough to avoid the ringing issues that switching amps have? I haven't read a bad word about ClassDAudio amps (other than that you can do better if you spend $5000 etc) so I'm guessing the guy has nailed it, although some people thought the top end was recessed, but who knows. The only other thing I'm worried about is the gain at 30db might be overkill for my speakers. My preamp only puts out 0.775 though. Mmm. Thoughts welcome.

Class A to Class D and back again.

I have owned a variety of Class A and AB solid state amps and after a couple of auditions I thought I could improve on my situation with Ncore, NC1200 Class D monos.  After a year, I found the Class D amps simply did not sound as natural to me as my former Class A and AB amps.  

Some might describe what I hear as a deficiency with "decay" but I usually describe it as a deficiency in micro-dynamics and, a flattening of the soundstage, or lack of depth/dimensionality, compared to better amps. They also seem to lag behind in the high frequencies and how those can create a sense of space, venue and infill between performers.  The end result could be described as the sound of individual musicians cutting tracks in a recording booth that are then put together to make music, instead of a band playing together and the music being recorded at one time.  To me the Class D amps were just not as real sounding, which is similar to the opinion of the reviewer at Mono and Stereo in his review of the Mola Mola Kalugas, that you can find on-line.

End result, I am back to a pair of 300 wpc Class A monoblocks and find that they sound much more natural and enjoyable in my system....although they are not quite as cool looking, cool running, or as quiet. 

The ClassDAudio goes out to 35khz, do you think this is far enough to avoid the ringing issues that switching amps have?

Its generally agreed that you need more bandwidth than that. Even the AES which tends to be overly conservative recommends 2 octaves above 20KHz (80KHz).

I can't comment about ringing- that seems to have more to do with the individual design rather than an overall characteristic.