Ledoux, there are two criticisms of the Straingauge SG, one I don't hear, the other could be valid.
One is that it reproduces vocals "unnaturally". Something in the tone or timbre of voices not being right. Why that wouldn't apply to a trumpet, I'm not sure, but the voices criticism is on the record, to do w SG not applying the RIAA curve.
All I can say here is that vocals sound fantastic. I guess none of us really "know" what Frank Sinatra, or Nina Simone, or Peter Gabriel etc, "really" sound like, so this criticism seems a purely intellectual one.
More relevantly, all our choices are coloured in one way or another. SG is likely to sound VERY different from a Koetsu, I could see how one could say the SG wasn't "correct" in comparison.
The more valid criticism is that the SG lacks that last iota of bloom or harmonic development. It "could" sound dry or pinched or, heaven forbid Lol, "digital".
Many things are at play here. So much analog is a bit exuberant in the lower mids and bass, with a level of euphonic warmth and lack of control, that the comparison with a way tighter and more neutral cart like SG is gonna be jarring. MFremer suggests the SG maybe trades swell and bloom for speed and precision...I can't deny that conclusion.
But imho, I think that's too simplistic. I've heard, and owned, many carts, that do the speed/detail thing over warmth, and they sound just as coloured and unnatural as ones that do the opposite...a Lyra Skala or Zu Denon 103 or Roksan Shiraz cool/ascerbic sound versus a Lyra Parnassus warm/plump sound.
The SG is the king of speed, but its tone is not dessicated in any way. I just feel like live acoustic music, it's organised, even handed, tonally and timbrally discriminating. And what could be called lack of bloom/harmonic development is indeed other carts being overly colourful and lacking last degree of control in lower frequencies.
These attributes of course highlighted to the max in poorly chosen ancilliary gear or poor analog installs. So yes, put the SG in a Class D/diamond tweeters/glass and concrete dungeon, and yr analog will sound bright and dry. Get the VTA and azimuth wrong, and it'll sound aggressive.
But as in my system, install the SG correctly on a revealing but evenhanded Terminator, thru a system suited to a large room (80W SETs into 101dB spkrs into an 800 sq ft/5500 cub ft room, acoustically very benign), and it's a revelation. It doesn't reveal itself as a fat, cuddly, sweet tooth sounding Koetsu or Lyra Parnassus, nor a ruler flat but ultimately unengaging sounding Clearaudio or Transfiguration, nor a seat of yr pants but ultimately shrill sounding Lyra Skala or Roksan Shiraz or Zu 103.
It really reveals the music, and as such is a killer combination w the Terminator.