The "measurements" in the Ultimate Audio review consist of reports of distortion at output power levels that aren't going to be reached over 95% of the time in any realistic listening situation, even with the most insensitive speakers on the market. I invite anybody who doubts this to listen to ordinary material at the sound level, measured with one of those Radio Shack meters, that the manufacturer lists for your speakers. It's almost never lower than 80 dB and for, e.g., Klipsch speakers it's up in the 90s. I think you'll find it pretty loud for sustained listening. (If your idea of sustained listening is headbanging rock at concert levels, by middle age you'll be experiencing the distortion levels of hearing aids.) Now that you're listening at that level, or now that you've turned everything down again, realize that you were hearing ONE WATT being delivered to your speakers. Look at the distortion chart in the UA report - logarithmic for the distortion scale (good) but arithmetic for the power output levels (virtually useless). The only information it conveys for the power output realm of sustained listening is that somewhere below 5 watts the harmonic distortion climbs to 0.1%. How high it gets in the area below 1 watt, you can't tell from this chart. And there's nothing at all about the much more irritating intermodulation distortion, or about the ratio of odd (irritating) or even (warm-sounding, even if not quite accurate) harmonics are present.
If you really want measurements relevant to sound quality, (1) the charts have to be logarithmic for both distortion AND power output, the output levels should be measured at least down to 100 milliwatts (remember, that's where most of the actual sound levels are if you're listening to music at "ordinary" levels); (2) there must be IM as well as harmonic distortion charts; and (3) ideally, there should be a report of the levels of odd vs. even harmonics in the harmonic distortion. You don't see that kind of detail often; sometimes in Stereophile, maybe.
BTW the reason tube amps often sound "better" than solid state, at the same price levels, is that most of their harmonic distortion is even-order.
Enough rant. Just remember, measurements like those in the Ultimate Audio report are cheap and irrelevant.