It has definitely kept me with NW (or skyteam, anyway...)
I had been thinking about jumping to AA or United for international upgrades, but the 4 SWUs are definiitely on my mind.
I'm about to requalify for plat - I'm positive that I'll hit the 120k threshold, but depending on how close I get to 160k (which I may not do w/ work travel - we'll see) I would certainly consider a MR