I e-mailed Sargent about the matter, and recieved a very prompt and informative reply. I think Im going to wait and see how my seat looks and feels and decide for myself.
Thanks for bringing your concerns to our attention. As you may know, our seats design philosophy is, in may ways, very different form our competition. We focus on comfortable, light-weight, feature packed, high quality seats for the Sport/Sport Touring market.
We offer (and recommend) vinyl upholstery covers because they are virtually maintenance free and do not leak. Unlike vinyl, leather often requires decorative stitch work to compensate for lack of stretch and difficulty of fitting - stitch work that can compromise integrity and cause moisture issues. Also, because of leathers lack of stretch, it tends to make a seat feel too hard by interfering with the foam suspension. You can read more about all this at our FAQ section the web site
http://www.sargentcycle.com/wsfaq.htm##3
The comments about the backrest quality may be mis-guided. Ours is designed to be quickly installed and removed. It slips in and out, snapping into place via ball detents, eliminating the need to "bolt-up" the part. As such, this design will vibrate/rattle somewhat when there is no passenger seated. If this is an issue for the user, by virtue of its design, it can be quickly pulled out when no passenger is riding. No need to remove the seat and use tools to remove the backrest.
Also the backrest has some inherent flex that is part of the system's strength (and comfort). This system has passed pressure test that far exceed typical loads. Specifically, 1000 cycles of rear force to the pad at an average of 130lbs (range 100lb - 160lb) each, without compromise to system structural integrity, or damage to motorcycle components.
The backrest hole cover is designed to be attractive and functional, and (unlike Velcro closures) water tight. These same components are used on many of our other seat models with no problems. However, we are aware a few early units early K12 units where customers complained of some difficulty with the backrest hole cover. A correction has been made on the K12S application and a simple "space kit" is available for customers that received these early units. We have since made a slight change to the elevation of the CAP and COVER unit (out of its surrounding recessed area) as an extra measure to insure ease of use, as the recess was causing some conflict on the K12S.
NOTE: The rubber "CAP" fits over a "HOLE COVER PIECE" via pressure fit. There is a small "lip" on the outside edge of the CAP that grabs a mating ridge on the outside edge of the "HOLE COVER PIECE". This action is similar to the way a plastic coffee can lid fits over a can of coffee. It does take a little massaging to seat it, but is very easy to do once the correction is made- takes maybe 5 seconds.
It's the first I've heard of a forced removal of the seat. I will need to investigate further.
I think your seat is slated for shipping late this week or early next. I hope this helps. Please advise if you should require a change.
Respectfully,
Mark - R&D