I have been waiting for somebody to make a simple mechanical seatpost like this for ages, to me it seems the best route forwards and has plenty of scope for future weight and cost savings. Despite all the recent competition I have always liked the simplicity of the GravityDropper (if only they changed that AWFUL lever), this seems like an improvement all round on that design. Having said all this I am very concerned about the wearing issue, I think CrankBrothers are trying to weasel out of a known design flaw there. This needs to be fixed before I will buy, but I will buy if it is fixed.

The cranks work with 68mm or 73mm bottom bracket, they come with the required spacers for both lengths.