I have a manual Pistorius VN-J underpinner for the past 5 years. It has been sufficient until now. Business is booming and I can't keep up with demand! I would like to invest in a pneumatic model, one that will pay for itself in time savings. I was thinking about purchasing a cassese but which model, who knows. I have not been able to attend the trade shows to see a demo of the new machines available now. Any suggestions or advice would be appreciated. Thanks, Chuck T.