I got a 4 year old Keystoker KA6 for $2000.00. Admittedly, an unusually good deal. Crazy guy wanted to switch to wood,.....emphasis on crazy!
I installed it myself. Total cost a little more than $3000.00. I had to buy a hot water to hot air heat exchanger for my hot air oil furnace to tie the two together. I've been more than happy with the KA6! As a first time stoker buyer, I found the Keystoker much simpler and less intimidating. Very few things to break or wear out. I would love an EFM, however, but it just didn't make economic sense at this time. The deal I found was just too good to pass up. You will be happy with either unit. Loading the hopper is not really that big a deal. You can always add an auger to move coal from your bin or barrel to the KA6 hopper. From what I've read, a KA6 can last a long, long time. Maybe not as long as an EFM,...but neither would I, at this point!
if properly maintained, either unit can be the only one you ever buy.