Well this morning it was finally still and sunny outside so I wanted to test the new props under better conditions, here is my verdict.
They work fine with one strange (somewhat minor) exception... when accelerating hard straight up the quad veers to the right. I assume some sort of imbalance causing this, and thought about installing them mixed differently in various combinations but don't have patience for it. Otherwise they work fine, don't notice a huge difference between them and the stock ones... maybe a little more speed and perhaps longer flight time, not sure about that.
Right after I flew with them I put the original slightly scuffed ones back on to do the same test and confirm it was the props and it must have been because with them it flew straight up.
So I probably won't use these 9443 props unless I don't have any others that are useable. I might like to buy another stock set (I am someone who always has backup) but it seems everywhere I find them they are carbon fiber like these
http://www.ebay.com/itm/291220971870?_trksid=p2060353.m1438.l2649&ssPageName=STRK:MEBIDX:IT
Should I expect they would be as good or better than the originals? They say stock but they appear to have more of a square tip than the ones which came with the quad.
My Typhoon TX (ST10+) replacement should be here tomorrow, and I have to agree with most of what I have read about Yuneec... their customer service is pretty good, they had no hesitation about sending me a new TX and are also sending another set of props for my inconvenience. Hope to get it airborne over the weekend.