I have absolutely no complaints about the seats in my 2016 All Terrain, I was able to get them positioned front and rear where I wanted them using the power lumbar to get things just right for me. I understand the leg going numb or sore, I had that with my Ranger that had power nothing, you got what you got with it, with this truck I expected firm cushions, it is a truck, but it is not uncomfortable by no means to me, I am 5'10" tall weigh about 185lbs. My seat doesn't feel like I am leaning to the left at all and I do agree the seat belt buckling is a little tight when buckling up but it's no big deal. Even my wife was surprised at how comfortable it is to ride in after we got her seat adjusted for her liking. As for trading in a truck because of the seats, that's just a little crazy in my opinion, cheaper to have the seats redone completely or custom seats from any number of manufacturers done up for yourself.
2016 GMC Canyon All Terrain 4 wheel drive crew cab with 6' bed in Cardinal Red. Mods, Pedal Commander and Elite E-2 catch can.