I recently wrote about the dangers of using MHupgrade- it is unlikely that you will secure tier points or avios/miles due for a business class ticket, and possible that you will lose the points due on your economy segment.
I am currently waiting to see if I get credit for a return flight where I used MHupgrade on one leg. I wrote about it here. There is no sign of these flights in my account yet. I'll put a missing avios claim in soon, I'll keep you posted!
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