I have used this twice over an open fire and must say I am very impressed with the product, packaging, accessories, and of course the results.  It appears they have thought of everything down to the heat resistant gloves they send with it.  I would say the biggest difficulty in using it is squeezing the fork clamps together while pushing it into the meat.  I have strong hands and can do it, I suspect someone with a weak grip will have some difficulty and a tool of some sort will have to be used.  The unit is easy to set up and use and easy to clean as well. To date I have cooked a 13 lb turkey,  a chicken, and a pork loin.  All turned out great and well worth the effort. This weekend a brisket!  Can't wait!!!