I don't know about all of these "first poster's" issues, but I used them recently for some MU biz class tickets, LAX-PVG-DEL and return. Referred from Kayak, they were the only OTA willing to book a very low price, 1/3 the cost of booking direct with MU, and much less than other OTA's. Purchase was normal, received res code and ticket number, credit card charged as normal. A few days later confirmed ticket was valid on MU website, and a week after that confirmed seats and added my DL ff# with MU by phone. No issues and no problems, but I am not trying to make changes, either.