Ah, didn't think about the problem that foaming would cause. So you just take the dirty keg/carboy, put it on the keg washer, and run PBW. Then, after ____ amount of time you rinse with water, remove from the keg washer, and fill with starsan?
I'm really leaning towards getting this, as I think it would just save me time. And, if I can catch this on sale at MoreBeer again, $90 is definitely worth the time it would save me. With a wife and two kids, being able to set the keg on the washer and then tend to other matters while it cleans would be a godsend.