I just ordered that same Burton seat for my Scrambler...I really, really hope that it ends my quest for comfort and an authentic/original look.
Though it wasn't indicated on their website, Burton offers a gel option on these seats...another £55 for the riders area, and £95 for the rider & pillion. An additional £9 shipping cost for the gel options due to additional weight.
That was too much $ (or £) for me. I figured I can get gel done here in the US later, for less money, if I want it. At today's exchange rate the cost for seat & shipping was $345.