Hey Plinko, The artifacts are phase shifts. The square wave stays good, its relative position is slightly different compared to where it should be.
I'm quite amazed at the diversity of the answers and the strong conviction behind the opinions. I'm on the side of keeping an open mind, as there are always surprises and it's so easy to run into the "I stand corrected" scenario. When going for recommendations, they all come through subjective filters. Just like asking about steaks: the answer depends whether you ask a meat lover or a vegan....
When people report loving something it comes from hearing a properly set up system with that topology. Negative opinions on the other hand come from lack of experience. Do not place much value on those (regardless of what architecture is being dissed.) Just remember: audio is not a perfect science, every topology has its flaws and compromises. When the ad says that one major flaw has been corrected, it can only be done through introducing a compromise somewhere else. In most cases the manufacturers are keenly aware of the shortcomings, but they don't want to rub it in our faces. (Product will not sell.)
All being said - solid state easier to find for show and crowd-pleasing, and SET for meditation and contemplation.
Just stay focused with your purpose: do not buy a horse to sing, and do not get a bird to pull your wagon. Enjoy diversity.