I have had no operational problems with milesource and have been able to redeem all my awards to date.
My chief complaint is that redemption levels can change without notice. The 4,500 point award I wanted became 5,500 just as I was getting close.
I am also shameless enough to suggest you use this link so I can be your referer:
http://www.milesource.com/join/join....rrer=ontheroad
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On the road,
In the air,
I enjoy travel
From here to there.