I am considering getting a custom TI SS bike.

Any opinions on the pros/cons of getting an integrated seatpost? (Seat-tube is longer and is your seat-post)?

A few Cons I see is limited flexibility (but should not be needed if the custom bike is done right) and resell appeal (which should be limited anyway with a custom bike)?

Would the comfort be similar to a Ti seatpost or the thickness is typically different?

Like this: