One man's meat is another man's poison, they say - and it can certainly apply to seats. One common thread in all high dollar-long distance seats is that they must be supportive of the inner thighs without cutting in, and the material must be fairly stiff/supportive so that your butt doesn't sink into the cushion and lose air-circulation. My corbin seat on my concours (which I have done numerous 600-mile days on) is just the ticket for this sort of thing. My LS has some added, high density foam, and I can ride 300-400 mile days on it, but it can be a stretch. This summer I did one 525 mile day on her, and it wasn't pleasant at all those last 100 miles.