I have the small oval (I think) nice support for the lower back. Angle is adjustable so you can pick how much push you want on it. 99% of the folks in the Nor'Easter last year had a slightly wobbly mounting tho, so we got a handfull of lock washers for the mounting bolt and it's fine now.
I think this is the best shot I have. I have a straight on profile shot in my gallery too.
