Bought it Oct. 2015. Barely on my 2nd or 3rd 8" spool, so it is hardly used. Selling because I want a Multimatic 215. The drive shaft has a slight wobble, thus the drive roll wobbles. Turns out this is normal as per Miller Repair center in San Antonio, Tx. You can see it in this video from ChuckE2009, at about 11:39 into the video.
If you leave the factory suggested starting point of 2 on the tension, the wire would sometimes slip, usually only if you curl the gun cable too much (thats how/why I started looking for a cause). Crank it down to 3ish and it has no problems feeding the wire.
You can get it brand new for $977 after $100 Miller rebate, or get it here for $800 + shipping costs. Only for sale this month because the Rebate for the Multimatic 215 expires this month as well.