Greg,
Per your request - from an HD rider:
- Two herniated discs.
- Still have my '95 FLSTN - original soft tail shock thingy.
- I ride both.
- Harley ride is "firmer."
- Done 1000 mile days on both. Less motrin required with the 6.
Now - do what the others suggest: go ride one. Have them put the rear pre-load on the "comfy" setting, see what you think.