Have you looked at the RDL sport seat option ? I can't find pricing for that on their web page, but it's wider, more sq inches seating space, a bit like Terry's seats.
I had the Adcox seat on my 2012 650, but went with RDL on my Vee. It's the second RDL I've had, and they just cannot be beat. I'm within a couple hour ride from them, so that helped me decide. I bought my 2014 Vee used, just before my annual summer trip. I knew 400 mile days on the stock seat would be painful, Terry was busy for months, RDL had a backlog, so I ended up purchasing a Shad comfort seat, hoping to make the long days tolerable. I was wrong. I spent a bit over $350 on something that gave very little improvement in comfort. I got home after a two week ride and told my wife, I love the bike, I plan on keeping it, butI need a comfortable seat, period. She said, buy a Russell. We loved our last one. Every moment spent on the bike, that seat matters. I'll leave home, ride to the Oregon coast, go north or south on 101, have a coffee and a lunch stop, clocking more than 400 miles when I get home, and never once, even think about the seat or have any discomfort or soreness. It's the main interface between me and the bike, and once soreness or discomfort sets in, it's miserable. I spend most of the cost of a single RDL on that Shad seat, then sold it for half what I paid, and paid half the shipping across country, I learned a lesson. Just spend the money, once, and be happy. If you can just get Russell to do the riders seat, you'll spend less than I did, my wife rides with me occasionally, and wanted the passenger seat done too, but, if you think you'll keep the bike for a while, it's an investment you may appreciate over and over.
That cover is their "sunbrella" fabric. Very durable, won't get hot in the sun or cold in winter, not slippery like vinyl, or require a lot of maintenance like leather.
so far, I'm pretty happy with it.