I've only put about 2k miles on mine so far. It's definitely better than the stock, but that isn't saying much. The stock is horrible and I don't know how I kept it on as long as I did. It would hurt after about an hour of riding. After a day or two of riding all I could think about is how bad my butt hurt.
The Sargent I can go about a half day before it begins to get uncomfortable and it's no where near as bad. It seems to sit a little lower. I think I'll ride it for a while then get a RDL or Mayer made. The whole custom seat process is a hassle when you live out east.
2009 BMW R1200GS