I waited for gene to test one these pioneer d3 based receivers to see how they perform on the bench, but as it appears that it is never going to happen, I thought I share one that I found online that has full bw tests of the class d3 amplifiers:
http://i.nextmedia.com.au/Assets/Pioneer_SC-LX89_AHF.pdf
While it is an older model, I doubt much has changed for these newer onkyo, integra and pioneer receivers (except for the two extra channels). And one thing that this article would appear to show is that the high frequency power output isn't really issue with these amplifiers, nor is the power output in general; I don't think there are many other receivers capable of posting 1/2/7-channel output figures seen in that review.
When I last visited this site about a year ago I was considering getting a TX-RZ1100 (found the "inflated power figures" article when looking for info on it) and based on reviews elsewhere I decided get one about 6 months ago and I have been really happy how it handles my fairly extensive use (up to 15 hours a day) in a relatively confined space driving my KEF R700+R300 setup with ease while remaining cool; one of my concerns when reading about traditional class AB receivers.