Emerald
I work for thwem right now. So far there is really no problem. I had a scheduling issue during the first 2 weeks, but I think it was more de to the hospital.
Another nurse at this hospital also was with Emerald and she HATED them. I will maintain objectivity until further notice! Emerald was recommended to me by rns at my previous hospital, so I thought it was OK. So far, it's good.

Emerald
I recently met a nurse who had alot of good things to say about them. I personally have never used them.

I work with 4 nurses, at Sutter Antioch, that use Emerald. The only complaints are they get paid less than the travs that use Agostini. I do not know how much less. The tax free package may be more though. I, however, have not asked what their hourly rates are. They do seem to be satisfied with Emerald.