The look of the 31 fits in with my place (tin ceilings mahogany panels leaded glass etc.) so for me thats a plus. Are they comparable machines,do the prices seem fare,I would guess the machines have to be hooked up so I can test them (common sense), is one more difficult to maintain than the other(parts labor etc.)will the 31 do much more volume than the 29,in your opinion do I not even want either or should I be looking for a different type all-together, how do I check how many shots the 31 has produced. As far as volume, there's no way for me to project that, 3 years ago I changed my Boston(just outside downtown) antique shop into a coffee shop.The neighborhood has been rapidly changing to a higher priced, (condos professionals)place to live. My regulars love my hot and iced coffee, but the new cliental want espresso etc. My place and the neighborhood is ripe for it. So I come to you folks and humbly ask for guidance, direction and advice. I do realize the final decision lay in my lap, but it is wise to tap into other peoples experience, especially when the subject is so specialized. What should I look for when I go look at these machines? I never made a shot of espresso in my life and I sincerely appreciate your patients and help.Joe