The phrase "are so impressive and" is correct and usable in written English.
It can be used to express admiration or appreciation for something that is remarkable or noteworthy, often followed by additional information or a conclusion.
Example: "The results of the experiment are so impressive and demonstrate the potential for future advancements in the field."
Alternatives: "are truly remarkable" or "are incredibly impressive".
The role of the Overlords, as midwives to the destruction/transformation of entire races, is simultaneously ingenious and moving; this is a novel of ideas rather than characters, but the ideas are so impressive and sweeping that it is impossible not to be carried along.
Yet the results are so impressive and unsettling that documentary masters Errol Morris and Werner Herzog both signed on as executive producers.
"Since the experimental and clinical data are so impressive and promising," Prof. Zhang said, "biomaterial ribs and pleura can be employed safely as an alternative to create an artificial chest wall to repair bony chest wall defects".
That's so impressive and comes through experience, focus and learning from every challenge he has had in his career".
I recently wrote about Ida Lupino's 1950 drama "Outrage," which is so impressive and moving that I felt impelled to discuss it in detail in this clip.
What's most surprising here is that the assembled talent -- from the worlds of basketball and movies -- is so impressive and, still, the work is so tired.
But the cast is so impressive, and the director so prestigious, that it desperately tries to contort itself into fine art at every turn.
Dortmund were so impressive and the only surprise was that the game was half an hour old before they took the lead.
Southampton's attacking movement and energy was so impressive, and Eriksen deserves credit for applying himself with the same quality to kickstart the Tottenham comeback.
"It is so impressive and overblown precisely because it was needed to give a false idea of national unity against papal power," he added.
The Goulds found a wealth of expressive detail in individual melodic lines, but it is the collective intelligence and insight of their playing that is so impressive and the Brahms, in particular, was made to carry a positively symphonic intensity.
