I have had 3 back lower back surgeries, fusion with rods and cages. I also have T6 T7 T8 with bulged disk. My personal comfort came in the from of a seat and I too will be going with the tri-axis on my RTL. Now with that said the biggest difference has not cost me any money, I simply do back exercise prescribed by my physical therapist and know my limits. I can ride all day and be in complete discomfort/pain when I get home or I can ride all day and be okay when I return home by simply stopping, walking and stretching every hour.