I love my XTZ, but for long distance that seat was just too uncomfortable (for me). For a long time I baulked at the price (even secondhand) and was very nervous in case it made no difference. Well so far it has! Hopefully these pictures will shed some light on this. Above is the Touretech seat (medium height) and below my stock seat. The top edges are more rounded, the back is more cutout so you sit a bit further back and the top is flatter. There is also a more gentle curve in the front. And most important is that it doesn't sag like the stock one. It is also wider giving more support (in all fairness it could even be wider still IMHO)

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2010 XT660Z Blue, Exan can, UFO high front fender, SW Motech baseplate, heated grips, 12v point, Kevs Fuel & O2 mod, DNA Stage 2 Filter and cover, Givi tall screen, Mefo mfe 99s, Kevs throttle mod, TT high seat and 'compass'