Ok there are things I like about the underwear: material is VERY nice. Soft and breathable but still snug. Waist band does not ride up. Fits very well.
However, the design assumes that the underwear will stay put at all times. It does not.
Sitting down, or even kneeling, causes the hole to move away from you which causes some awkward "tucking up" kinds of feelings. I have to reposition everything to get comfortable again. Walking around causes this over time too.
I would buy regular underwear made by this company because the material is amazing and I love the fit, but also. The entire hole thing ruins it for me, it's not worth strangling the little guy over.