Barnbaum's prints are amazing in person. His teaching skills are also excellent. I discussed his printing workshop with him while attending his Death Valley photo workshop. They sound very hands-on, although he was doing less of them in light of decreased demand at the time (2009). He will schedule one on one sessions if you prefer. Either way, I have no doubt it would be a fine investment. If life hadn't gotten so busy recently, I'd be going this year myself. No doubt there are other great workshops, but don't underestimate Barnbaum.
B.t.w., does Bob Carnie do workshops? He sounds like a great resource as well.