I am researching the Selle SMP glider and Lite 209, (I have a Selle Italia Turbomatic, which I've been happy with but the gel is breaking down already and causing issues. This is after about a year and 10,000 or so miles) and came across this great article on Steve Hogg's site

http://www.stevehoggbikefitting.com/...l-about-smps/#

Very interesting stuff, especially how the width of the saddle doesn't necessarily correspond to ischial tuberosity width.