The best, most useful item is the deer sleigh, a big rolled up plastic sheet to load and drag a deer on. It works great on leaves, dirt, or whatever.
The worst? You must mean all the guns that I bought, tried out and then traded back in for a loss of $$$$. No, just kidding! Probably the Black Canyon black powder substitute that came out about 5 or more years ago. It went right into the toilet and got flushed. (I didn't even do that to the expensive deer urine!)