help me understand set-back seatposts
ordered a thompson straight post online and was sent a setback post instead. before i decide whether to return it or not, what's the real difference? how big of a change am i going to notice between the two?
is it going to be aesthetic more than anything?
is there any point to asking this without trying it out first?
currently riding a bianchi giro with a setback post and 90mm stem.