My two bits- when I switched from a Mamba 'river play' to the 'creek' model- which had a deeper "bucket seat" I had a heck of a time rolling it at first, tho I could roll the 'river play' model all day. Physics be damned! (And I do fluid dynamics for a living!). I felt like I was reaching up from the bottom of a well to get my set-up. I finally got a Jackson Sweet Cheeks and that gave me enough lift to get into position. Now that boat rolls almost as easy as the river play model. However it is a s-l-o-w roll compared to say a Fun series boat which I find insanely easy to roll.