They must be different now than on earlier (pre 14). Tall boy my friend has on 04 E/G is taller than the regular E/G seat enough that I have to tippy toe to reach ground, no problem flat foot on a normal E/G seat. It does move you back, but definitely not down on this older model. Maybe post '14 is different.
I believe they are.
https://www.harley-davidson.com/us/en/shop/tallboy-seat/p/52000252DESCRIPTION
The seat is sculpted to provide superior support and comfort, with a slight bucket shape to provide room to vary your riding position fore and aft. The seat’s level seating surface does not pitch the rider forward, and the overall ride height is similar to stock Electra Glide® and Road Glide® Ultra seating.
• Moves the rider back 1.5” to provide much-needed arm and leg room for the long-limbed rider
• Passenger comfort will be maximized with the Tour-Pak® Luggage mounted in the rearmost position
• Tallboy® seats can be equipped with an optional rider backrest (except Adjustable style) for additional touring comfort
•
Measurements based on Original Equipment Electra Glide® seat• Seat width 16.5"
• Passenger pillion width 15.0"
• Stop by a participating dealer and test out this seat today as part of our Seat Demo Program –contact your local dealer for details
When I went to my dealer to take the demo for a ride, the parts guy read the description right off of His site that they use. Now with that being said, Maybe the sitting back more also felt like it was also lower but He told me that it is lower and that's from reading it off of His computer. Now maybe what He was reading was comparing to the Hammock is how He came up with those numbers. I know I like that position a whole lot better than my heated Hammock. Doesn't hurt or cost anything to take one for a spin. I'm keeping an eye out for a gently used one that isn't the cost of a new one now.