I have Burly Brand beach bars, They are very comfy.. But not for agresive riding .. Just for crusing I would say...No back pain at all. and they look awsome
I have a bad back so I know how you feel. Both bars are comfortable but my issue with the asps was I felt like a sail catching all the wind on the highway. It killed my lower back. The beach bars are lower and I don't have that problem with them. If back pain is your issue the lower bars are the way to go.
I had the same thing going on, found myself leaning slightly forward. Put the narrow beach bars on over the winter with 4" pullbacks and my hand and wrist position was perfect for a long drive. The only problem was I did not like the looks of the beach bar so I removed it after a 3 mile drive. Now it's sitting around collecting dust.
NikonF8's bike is growing on me. I may do a detachable windshield for longer trips with the Beach bars this is an option. Still not a big fan of the Windshields.