Air Seat Saddle Suspension System

Just got my Air Seat. It was perfectly packed and right on time. I ordered August 5 and it's now August 11. Six days from half way around the world. The manifest says it went through Anchorage en route. I've got a Brompton and the installation was pretty straightforward. The additional costs were shipping via FedEx -$20.90 and Duties - $12.28 so that came to a Total of USD $93.08. I had searched on Amazon before ordering directly from Thailand. Couldn't find it there so I ordered direct. I also called numerous US Brompton dealers. They didn't know what I was asking for. I did another search a few minutes ago and discovered that on Amazon it's not under Vincita. There's no savings, however. It's $94 and there's no large (weight) ones available on Amazon. I have no idea who or what the source is. I'm 6'2", weigh 225 lbs., and ride in an upright position on my Brompton. I got the one from Vincita designed to cushion my weight and riding style. There are four sizes available. I live in Detroit and the City has chosen to litter the street with speed bumps that run continuously with an open space of about 18 inches against the curb. The problem there? Broken bottles, parked cars, trash bins, and street litter. I tried riding over the speed bumps after I installed the Air Seat and the impact was softened considerably. I'm liking this suspension system and will probably order more directly from Vincita for my other bikes and my friends. They (Vincita) make good stuff.