I've done around 2.5k with my Sargent seat now,most of which has been on two trips,with a couple on longish days in the saddle (10-12 hrs).
My standard GS seat was very uncomfortable after about 90mins so I managed to locate a second hand Sargent seat.When first getting on I was finding it difficult to understand why people raved about them as I felt it was no more comfortable than the standard seat,but after a while they come into their own and appear to mould to you as they warm up,even after 10 hrs in the saddle my bums a bit numb but not painful.
Most probably the best mod i've bought.
Steve