I have a Saddlemen Classic gel seat on my 900 Classic LT, with about 8k miles on it. It's been a pretty good seat for me. My longest ride in a day on it was a little over 300 miles. My butt was getting a little tired at the end, but it wasn't too bad, certainly much better than the Kawi original seat. I don't know how it would do on a multi-day trip running 300 per day.
Generally, I do local cruising for 2 or 3 hours and average about 100 to 150 miles or so. The seat works fine for that and I have no physical issues when I'm done for the day.
hope that helps
2010 Vulcan 900 Classic LT