No usage per se but I just logged into my account to OLCI for a flight tomorrow and I noticed I had 2 additional GPUs.
I thought sh!t did I just loose the upgrade on the flight I was checking in for?
Nope that wasn't the case.

A flight just cleared which put me over $10,000 PQD and my PQMs are just over 65k. The 2 GPUs expire on 1/31/15 which is the date the one existing GPU I already had in my account does.

I know that you can get 2 additional GPUs for each 50k PQM or 60 segments you fly. But I thought that meant it was in the same qualifying year...as if in 2013 you flew 150k PQM you'd get 8 GPUs, 200k PQM 10 etc.