I love the Splashabout nappies, too. Had one for DD. But she never did a poo in the water anyway, so I didn't mind the pull-on style.
For DS I bought a Motherease one because of the side snaps. I didn't fancy the thought of dragging poo all the way down his legs when getting the nappy off after an accident. Having said that, he has never done a poo while in the water and we go swimming regularly.

Sasa