So, the $200 spareparts harness/boxer briefs do a slightly better job BUT there’s a $150+ difference.
If you’re on a budget these are fantastic, if you have all the money in the world or you really *need* perfection than the spareparts tomboii is the way to go. The tomboii has more positioning options than these for sure! These are good if you only want front and centre or tucked between the legs.