I too wear a unibomb and the thing is the BEST EVER in regards to dry, super comfy (nothing to strap around your waist) and easy.
I do creek in it, but have been warned by Clay Wright and other much more hard core boaters than myself that the log across the bow (ie, over your skirt) thing not only can happen, but apparently does happen and in that situation, you are screwed.
My preference is to use the more common two piece setup when doing REALLY tough runs where I know I could be in a tight situation. When river running and playboating the Unibomb is the ONLY way to go.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body. But rather...To skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming... WOW !!!! What a ride!!!!!!"