I currently have a Next Gen 750 Vitamix and use it to make a shake every morning. I load it up with veggies and fruit (to heaping over the top of the container) and blend it down to about 60 ounces. i use no water or ice, and for liquid use about a cup of nut or soy milk.
Another use is to create a "veggie mash" for my dogs. I use no liquid in this, just that from the veggies.
I very often have to wait for the blender to "cool down" after the motor protection kicks in and shuts it down. This is a pain and happens on every blend with the "veggie mash" and about 4 days out of 7 with my morning shake.
None of my other machines ever "overheat" no matter how hard I push them. I have a Norwalk juicer that I used to use to macerate the veggies for the veggie mash, and that machine can run all day. I also have a Wolfgang Puck induction food processor (which is quite a beast but they stopped making it), that will also run for hours under what ever load I can throw at it. It gets hot but has never "shut down" due to heat.
I was seriously considering the Vitamix XL 5202 which has a more powerful commercial motor (and I think it would run all day), but read on amazon that it is geared down and doesn't run at as high a speed to create really fine purees. This would be a problem but I have no way of making the comparison. The so separate their product lines as to not allow any comparison.
Does anybody have any insight? I love the lower profile (motor behind) design of the XL and it is also programmable. I'm pretty sure it wont overheat and I can use it with the smaller 64oz container for daily use.