Get the cast iron bench dog! I bought the $1400 package deal from Sommerfeld last spring. The quality control on the extrusions, forming the table, was horrible. The edges of the extrusions are less than 90 degrees so that when you bolt them together, the three pieces form an arc. I was told I could send it back to them, at my expense, and they would judge whether it was workable or not. For $1400 of my money it needs to be right, not jerry rigged! In less than a week I decided to take advantage of thier 100% money back guarentee and send every thing back. I did get a refund for it all less shipping costs. It was a terribly dissappointing experience. My understanding is that the extrusions are now coming from China and not ALCOA as once advertised.
I'm now looking at a woodpecker PRL2 and the cast iron bench dog.