I have both the stock and magnum seat for my XC.
The magnum seat does sit you lower. I would guesstimate 1/2". I love the looks of it but my daughter and wife do not like it for 2up.
I can almost flat foot my bike with Mag seat but I am on my tippy toes with XC seat. My bike also has a 1" lower link. I am one of them funny shaped guys with long torso short legs (good for wrestling).
I get lower back pains with both seats on long rides. It does seem a bit worse with the Mag seat. I don't think its my seat though. I think I need longer bars so I don't have a bend in my lower back.
I think I might send my stock seat to get worked on this winter and sell my magnum seat
or even try a mustang seat.
2015 XC Gloss Titanium Metallic
Addons: Trunk, Lowers, Chin Spoiler, PCV, Lloydz Cams,
Lloydz timing gear, Lloydz air filter, Adom Bombs,
Keyless ignition, XM radio, Heated grips, Magnum seat,
Passenger floor boards, Witch Doctor exhaust tips,
Extreme audio kit, and Painted inner fairing.