I had some bad fans that wouldn't spin or that would wobble so bad they would hit the shroud or heatsink. Can't get stock GPU fans.
I just finished installing new 120mm fans to my second rig, I'll do my third rig tomorrow. Temps are great, and fans are quiet. This is a great solution if your fans are going bad and wobbling. If anyone is interested, for $20 I can get you 2 fans and wires, you'll also need thermal paste and zip ties.