The Demon is made for the double penetration. Women would get the most use out of this toy, though men will come in a close second. The suction cup has a nice grip, and you will need it. Beginners can easily work with the toy if they are only using one toy per hole in terms of penetration. More experience is recommended if you attempt to DP yourself in a single hole with the Demon.

There is a mild texturing, somewhat realistic, on both shafts. There isn't really any smell to the Demon, which is always a good thing. The material is mildly plushy. The top shaft is more rigid than the lower one, which tends to bow out near the middle.

I think the design is a nice one. The size of each shaft is about average, sure to please the ladies out there. Combined they are not so thick as to be painful on a double insertion. The connector between shafts is very sturdy, which is a good thing in my view. You can easily hold onto that part to thrust the Demon into yourself.

Being a male, I used this to DP myself. It was something of a challenge to get it inserted. The lower cock tends to flex in the middle. My main trouble with inserting both simultaneously was having the head of the lower cock push backward as it flexed. The suction cup held rather strongly, though it can pop loose if it isn't on the same level as your body. The more it has to flex upward to get inside, the higher the chance of it popping free.

The Demon is silicone, so you can boil it to clean. Wiping it down with toy cleaner is also rather easy, given how there are very few nooks and crannies. For lube, you need to stick with water-based, my preferred lube in all things, and not much is required. Storage is simple enough to place it in a box or bag and tuck it away somewhere. A bit of care should be taken to keep the shafts separate, possibly by wrapping one or both in a dry paper towel. This is to mainly keep the silicone separate from one another.

Getting both of these in your bum is a pain in the butt. Though not in how you think. It took me numerous tries to manage this, not from the size of the toys, but from the fact that the lower one just would not cooperate. A stiffer spine on it would have been a huge improvement. I found that the best way is to clamp your hand down on both shafts as hard as you can while pushing back on it. Especially near where the lower shaft is so flexible (you can easily tell where this is). An enema beforehand to clean yourself is highly recommended, as this allows you to push down to open yourself wider and help the heads get inserted. Once they are in, it is easy to use and feels incredible. You can feel the shafts rubbing one another inside you, and it's enough to make the knees go weak when you take the Demon in hand and start thrusting both in.