Originally Posted by
rpenmanparker
There are easily demonstrated points, but they only matter to those who care about those things. Lower weight for a build using an ISP. If you don't care, see, it just doesn't convince you. Better flexibility with the ISP. Neat appearance. The points are easily demonstrable but only to those who care about those things. Same on the other side of the argument.
They are not lighter. There are threads over on ww documenting how to customize an ISP to get the weight down.
They are not more flexible than a flexible seat post you can select yourself.
Make up a personal-value argument if you insist, but please use points that are at least objectively true.