Changeable gullet saddles don't work for every horse. The tree has to be the right shape and the back panels have to fit the horse. The tree from front to back also has to fit. Wintecs tend to be "flat" front to back, so they don't fit horses with "curvy" back well. Also the panels tend to be pretty angled, so they don't always fit horses with broad/flat (side to side) backs very well. If you use a good pad and ride less than 2 hours at a time, then you'll probably be okay, but if you do any heavy riding (lots of jumping or long trails) frequently, then your horse can end up with sore spots and/or pressure sores (white patches).