The Jotter has always been a small, skinny, lightweight pen, with a plastic lower barrel and a thin metal upper barrel and clip. It tapers down towards the tip of the pen, and yes, with that thinness I see it being a non-starter for those with large hands. The XL does solve that issue, but I think that is where the benefits stop.
Due to the taper that is also present in the XL, the pen becomes more unbalanced the lower you grip it. It is a high-grippers pen, if you will. The top weight shift is not drastic - it's still a generally light pen - but I could feel it instantly.