Hi James,
I've been using the small Santha 11 for a little over a year now, just for development purposes. We recently upgraded to the Santha 100 as we prepare to launch our line of craft chocolates.
While I have not used it excessively to provide an in-depth review, I have found that the quality and performance of the Santha 100 has been good. As Sandy mentioned, these are typically drop shipped from India so you will need to change out the plug yourself or have a qualified electrician do it for you. This was something that was disclosed to me prior to purchase so was not a surprise. I bought my unit from John Nanci at Chocolate Alchemy who was very helpful with support and setup.
Aside from size and power, there a couple major differences between the Santha 11 and Santha 100.
1. The Santha 11 is belt driven whereas the Santha 100 model is chain driven. This is a big plus as I had my belt shred on the 11 model.
2. Speed controller. The Santha 100 comes with a speed controller which can be very useful. At very high speeds you may find some of the chocolate splashing out of the bowl. The speed controller can help you to dial it down or up as needed.
3. Tilting mechanism. This is a must for the Santha 100. Not only does it help with getting the chocolate out (I couldn't imagine picking the bowl up by hand) but it also helps with the cleaning process, making it very simple.