Interesting but I preferred the old approach using e500 or CR1's. But I also have more upgrade instruments then I can use so its easy for me to say. But this way I could get my wife at least once in a while an upgrade by sponsoring her. So now no sponsoring of relatives anymore ?
Also how does it work if e.g. 3 people are on 1 PNR like me going with my wife and son to Hawaii ?