This toy is best suited for vaginal use with a strap on harness. That's not to say that you couldn't use it with your hand, but the shape of it isn't conducive to self play. There is no handle to speak of so you partner might have a time trying to grip it.

If you do choose to use O2 out of a harness, twisting him can greatly increase g-spot stimulation because his large head causes greater pressure in those specific areas than if he was similarly size all the way down.

Also, If you were wanting to use this product anally, you should use extra lube. Tantus silicone seems to dry off faster that other silicones like Viskin.

O2 has no smell to speak of and the highest safety rating. This is the kind of piece you want if you're going to use it regularly.

The dual silicone provides strength and softness. The inner core is higher density silicone. The outer layer is lower density and provides give to make rough play possible. Tantus did a great job. The rigidity is very close to the real thing, slightly more flexible which allows for a greater range of possible positions.

The veins are visible and easily felt in your hand but not so much inside, kind of a bummer if that extra texture draws you.

This toy's realism is only in shape. However, the color is great for fantasy role playing. The Purple has a very dead look to it which may turn some people off. Also the white silicone turns grayish over time.

The size is small to medium for me, but I've found that I'm a poor judge of what is too big or small for beginners because this was my first dildo and it's stated to be a larger one generally not one for beginners. However, if you are willing to work with it (use lots of lube) and can be relaxed, it should be quite worth while.

This toy can take a beating and will probably last forever if you give it the least bit of tlc. I found that it performs the best with a harness.

You might have trouble with o-ring harnesses since 02's head is much larger than his base. He fit quite nicely into the SpareParts Joque harness, though.

My partner and I use toys almost exclusively and we found this product to be satisfying. However, you should be careful since this product is quite rigid and I found myself bruised if it was used too roughly. Conversely that rigidity makes him great fun for use with a larger massager since the vibrations will transfer down his shaft more strongly than a softer dildo.

Silicone toys are a breeze to care for. Us a little soap and water, dry it, wrap it in a cloth, and you are all set. You can even completely sanitize them by boiling them or running them through the dish washer. Keeping it dry is important because they can mold.
Water based lubes are what you want for silicone toys. Other lubes just aren't safe and can destroy the toy entirely.