Yesterday it has arrived. It's a beauty! I was a bit lucky as there was an hour maybe just to have a quick test before the fog arrived. Unfortunately the seeing was not my friend and I had to hurry so I was just jumping from target to target. Extra aperture clearly brought slightly brighter M42 compared to 80/600 just as expected. Venus was more disk-like than in the smaller scope. No annoying color fringing, at least for my taste. I found finding the perfect focus was a bit harder, but it may have caused by poor seeing conditions as mentioned earlier.
About the OTA: it is a really nice scope, mechanical design is flawless! Sliding dewcap fits perfectly and easy to move, the matte white finish is so elegant. Serial number on the lens strenthens the feeling that it must have passed a proper QA. So bad that I was not able to make a proper test with tight double stars. Defocusing bright stars brought nice concentric rings both in and out so collimation is perfect, I did not expect anythis else on this. The focuser is a dream! I have never used a good rack and pinion style focuser, only the cheap ones plus Crayford-style on my previous ED tube and the special one on Maksutovs. It's a different thing. No accidental sliding with heavy eyepieces or camera attached, just smooth operation. It was a new thing for me that both 2" and 1.25" connection is a ring, not screws. 1.25" holds the diagonal perfectly, but using that I have to take it out from the wider one in order to properly pinch the ring. I felt pinching of the 2" ring is a bit loose, at least I felt it's still can slip out even on tightest position. It's still okay, but it would be good to tighten it a bit more.