The dual design was the selling point for me and it actually works — no harness to fiddle with, which made things way less awkward the first time. The TPR has a bit of give to it, so it doesn't feel harsh.
The double-ended TPR design is what sold me, and it works exactly as hoped — both ends stay comfortable and the material has a nice give to it. Being able to use it without the harness was a pleasant surprise too.
Wasn't sure about the no-harness fit at first, but it actually stays put once you get the angle right. The TPR has a nice give to it without feeling flimsy. Wish the 15 cm were a touch longer, but it's a solid pick for couples.