I'm like the goldilocks of harnesses, they've all kind of been not-quite-right (straps are too loose; straps cut into my sides; too many straps and velcro bits to feel sexy) but I LOVE these ones.
Simple, comfy and discreet under pants so I can wear them out and then, when things get sexy, I'm already set to pop in a toy - no fussing with straps!
This is the first time I've bought a harness. It looked and felt great. I moved around a fair bit -- standing/walking, sitting, and lying down -- and my slender Vixen Spur dildo stayed where I wanted it. Based on how well it held the dildo in place, I am confident that it would be effective for partnered play as well.
I bought the Large/XL. I have 39" hips, and the fit on first use is indeed snug, but very comfortable. It feels snug as in secure, rather than snug as in too tight!
The washing instructions on the tag: hand-wash cold, hang to dry. No ironing, no bleaching, and no dry cleaning.