The best seat I ever had on a bike was a Corbin on a 1975 BMW. The one on the '88 K100 was less good (still better than stock), and didn't fit quite as well...and that was a BMW factory swap-out! I ordered one for a '95 RS, and it was gawdawful. Incredibly heavy, didn't fit (in fact I had to take it off to avoid damaging bodywork), with iffy workmanship. I gave it to my dealer to send back. Thank goodness I'd ordered it through them!
In the meantime, Corbin's customer service went from terrific to "take it or leave it," and their prices have vastly outpaced their competition. I know of happy SoCal folks who can go in for hands on modification, but if you're not close, they don't seem to care. Even their vending dealers have problems getting customer issues fixed. Too many other options out there to risk the dollars and the frustration. YMMV.