I actually love the oversized Stirling tubs. Loading the brush is a breeze and far less messy than with the smaller tins or tubs.
Since my tub is nearly brand new, lather spills over the rim while I'm loading my brush. I know small companies need to limit the number of SKUs they offer, but I'd love to see them offer their 5.8 oz tub for you, and a 4 oz cake for me. So far, though, I like their soap, so I don't think the big plastic tub will become a non-started for me.