I had a Rick Mayer seat on my 05 ST1300. Sent him the original seat along with pictures of me sitting on the bike and of my wife and I sitting on the bike, as requested. It came back as a beautiful seat and on the first ride I thought it was great. After a bit, though I found that it wasn't what I wanted as far as comfort. Bought a Sargent World Sport seat and lived happily ever after.
I just remembered that I had quite a bit of a hassle getting my seat back anywhere near the time originally promised and I wasn't the only one that had that problem at that time. He may be doing better in that respect now, however.
BTW, I have talked to the modification guru at Sargent and I have ordered a spare front seat from Yamaha which I will be sending to them next week to have them modify for me. I know that it probably won't be as good as the World Sport that they will eventually make, as they normally make a wider seat pan for those, but it should be better than what I have now.
I should have been sending the spare seat today, as it just arrived. The package had the correct part number, 23P-24710-10-00, but they sent the rear seat. We are sending it back for an exchange.