The plug slides in smoothly and stays put, which is the part I was most nervous about, but the ring fits snug without cutting off circulation. Everything arrived in one tidy kit, so no hunting for separate pieces.
The cock ring fit snugly without feeling too tight, and having the plug and ring bundled together saved me a second order. Everything arrived discreetly packaged, which I appreciated since I wasn't expecting the kit to feel this well-made for the price.