I prefer the Sundowner over the original on the Breakout, but at least on that bike I don't notice any push forward. I did a photo comparison of the original vs Sundowner set for the Breakout. I don't know how other Sundowner set compare, but here's what they looked like for the BO...

 

Nice comparison pic. Yep the Sundowners are much more comfy than the stock seats and are 2 pieces when you want to go solo. Your passenger will thank you. We did a 1,000 round trip mile tour this summer and the sundowner rider seat had me not thinking at all about the seat, just the great riding. My passenger did ok but as you can see its not an Electra Glide...

 

Those two pillions look like the stock and the larger HD pillion that i have for my deluxe, but without the fringe. Interesting.