For me, bike fit is an almost sacred thing, especially seat height and placement. Buying a bike that might be close but not quite? Better not be one of my good bikes.

Again, for me, the key issue for seat height is knee bend. That is affected by shoe thickness, cleat height, pedal design, seat shape and my position on the bike. Yes, in theory, all this should be measurable and known. I draw up my bikes on the computer and estimate seat height and setback from that. But still, I am carrying the wrenches and am tweaking on my early rides. If I found I was at the limit and wanted a hair more, I"d be very upset. (Except that won't happen. I won't buy a bike that has anything "pegged" or "slammed". Well I might, but only if I knew I could easily have the part custom made that would rectify that issue. Slammed regular seatpost? Getting a custom post of whatever setback is just a matter of money. It is easily made. Seat masts? Count me out. My body or needs might change.)