Herman,
It might be helpful for you to call John Shiflet (Cookshack's National Sales Manager) at 1-800-423-0698. He has been in this business for decades, and he was around when SP copied our electric smokers several years ago. He compares the two all the time for people at trade shows and who call up. As I recall, the SP's capacity is quite overstated, but you would need to talk to John to get accurate information.