So I'm not really sure where else in the forums to post this but it seems somewhat relevant. I saw this today (on something to maybe buy..) and I'm just thinking it looks like a rather bad and dangerous idea, on the other hand it's from a rather reputable french frame builder, Alain Michel, who whilst he's made a number of interesting frames none have been considered dangerous.
What it is is a seatpost clamp integrated into the top tube of the frame using a hidden bolt and clamp similar to on certain Cinelli stems (those Cinelli stems that had this particular setup often didnt work so well, for what it's worth):
Looks a little mad to me and surely prone to cracking as it's removing a lot of material from the tube (it looks like it avoids the lug, just) at a place of high stress on the frame.
Anybody any thoughts on it, could there be any positives to this?