The stock Speedmaster seat and the Triumph touring seat both had my tailbone in pain by 50 miles, not nearly enough lateral support. Got a Corbin, huge improvement - I'd strongly recommend it, especially for larger riders. Still not perfect though, I'm waiting for the full break-in period to see if it softens up a bit; I'd rate mine a little too hard yet, still can't go all day. If it's not softened any in another month I'll consider tweaking it. Still a vast improvement; I'd still strongly recommend it.
Had some trouble with Corbin during the ordering process too, but have heard others rave about their customer service. The fact that you can send it back for free adjustments is impressive. This is my second bike with a Corbin.