I ride an hour and some to work every day. I was definitely saddle sore by the time I got there on the stock seat.
Upon recommendation from a friend, I bought an Airhawk and that was decidedly better, extending me to about 2 hours.
Finally I took the plunge and got the Corbin. Only been on it a week or so but love it!
It's exactly like everyone says: Immediately noticeable difference, considerably stiffer/harder. But its flatter, more bench like so it belt better right away. I am anxious to see how it is long term as I break it in more, and also to take it out for more than a couple of hours.
Only side note I have is that this seat does push my legs out a bit so ground reach is compromised. Not an issue for me with a 32" inseam, but worth noting.
Sounds like a great trip you have planned! Good luck, hope you get some great weather and travel conditions!