I love my ultimate with backrest as I have previously posted. It does sit a little higher, but I eventually got used to it. When I scoot my butt forward and lean back and have my feet up on the highway pegs the height difference goes away. More comfortable than my recliner at home! I've also noticed that the seat becomes much softer and you sink down more into it in warmer weather and vice versa.
I had to wait 2 weeks but mine came in Wednesday and installed today. only rode 15 miles so far. Install wasnt so bad. Had one rail bolt give me a fit but finally got it. I cant wait to take it for a longer ride. Maybe tomorrow morning before it gets to hot for me.
I installed my passenger riser from them today. The wife thinks it makes the backrest look like E.T.'s head but I'm willing to bet she won't care after she rides on it after using the stock position for so long.
Ultimate makes great seats. Had one on my VTX 1800 and Road King. Most comfortable seats I've tried. Sure wish they would make a low version for the F6.