The use of this item, as stated on the website and product page, is for kegels. It is supposed to cause your body to actively do kegels without you really thinking about it.
The size is a little larger than it appears in the image, so I would suggest, unless you naturally and easily produce your own bodily lubricant, that you use a little lube when inserting to avoid too much friction or discomfort.
This toy, in my mind, is best suited for any woman from the age of 18 and up.
There is no one best situation this ball can be used in. I have used it in riding a bike, walking my dog, jogging, running, and riding in a car. The use of this item is not inhibited by situation. If anything, it only causes a mild excitement in those of us who enjoy the thought of wearing a toy out in public.
I would NEVER use this for anal. It is not shaped for it. As for the texture, it would also cause some issues when being inserted or being pulled out.
The band/string that is attached to the egg shaped toy seems to be strong, but I would not pull too hard on it. If anything, it stings quite a bit if/when it slips from your grasp and hits your nether regions like a rubber band.

The material is a hard silicone with a slight velvety feel to it. I have not tasted the toy, and the smell isn't very pronounced. As a matter of fact, I have not even noticed one.
The texture does add a bit of sensation when being inserted. As the only times you truly feel the texture is while being inserted or withdrawn, I feel that isn't something of great importance.

I have a few words on the design and shape of this product. As a matter of fact, I don't think I have anything negative to say about the design or shape.
Design: I actually enjoy the design. When you purchase this there is, generally, a moderate selection of colors to choose from. As my favorite color is turquoise, it is a little hard to find toys with this color. I was quite pleased to find it in the Smartballs Teneo product. I actually bought the pair (uno & duo) when they went on the $40 for the set. The way the material is designed, it feels rather smooth once inserted, which makes it easier for everyday use.
Shape: The egg shape allows for easy insertion & removal.
Size: The size is a little large. It can be uncomfortable when inserting without lube due to the texture and size of the toy. I believe for the average user, it would be the same.

Suitability: I do believe this toy is suitable for any occasion you have in life, be it from sitting at your desk, to working on your feet all day long. It is very versatile and extremely discreet as it does not make any noise at all.

Pros: The pros are simple, Easy to use, Able to use it at anytime during your day & night, Completely Discreet, Comfortable, Does not require batteries, No mess, Does not need another there to enjoy it, Is very useful in tightening your vaginal muscles, Easy cleanup, and storing.
Cons: Not so much sensation when you first start, a little on the large side.

As this toy is silicone, it is a very safe, if not the safest, product to use. You can use hot water and antibacterial soap, boiling for a few minutes, or wash it in the dishwasher without detergent for the cleaning care of this product.

As silicone and like materials have a tendency to collect dust and lint, I would recommend rinsing it before each use. I also recommend storing it in its original box, or a box that does not have cloth that would touch it.

As always with any toy, I would recommend you sanitize it if you plan on or do share this with another person.

This toy was not packaged in a very discreet box, as there is a window in the box that shows the product. There are also diagrams of the toy on the side of the box.
The instructions come on the box as well as a small little insert inside the box. It comes in German, English, and a few other languages, so I feel it covers the bases though the product is quite self explanatory.

I would not suggest using the original box when giving as a gift. It is not the most ideal location when storing, but if that is the only place you have as you are just now building your line up of adult toys, then it would work in a pinch.

There aren't many more comments I can say about this product. I do think that you become more sensitive to the movements within the product the more and longer you use it. I would suggest this product to any beginner who wants to try a kegels exerciser.

My first thought during my first use was, "Wow this is big". I'm not a small woman, but neither am I a loose woman. I had purchased this for many reasons. A few of them being medical, but mostly because I had always wanted kegel balls, and this seemed like the first step (baby steps from bigger to smaller).

The first time I inserted it, I inserted it dry with no lube because I had run out the night before the product arrived. I didn't notice that inside the box there was a little sample lube that came with it. Might I add that the lube that comes with it is quite nice.

I wore it all day from the time I got up, to the time I was ready for bed. I barely felt it other than feeling full, if you know what I mean. I was a bit disillusioned with it at first. When I went to remove it I was kinda surprised how much, without me really paying attention, it had helped me locate certain muscles that I hadn't before really paid attention to. Not going into much detail as it's a tad embarrassing to me, but suffice it to say I now pay attention to it even if I'm not feeling it. I do my kegels even if it is supposed to exercise those muscles without me needing to do the kegels.

It may not seem it in the beginning but after a week of constant use, I can tell the difference from before using it to now.

So, I would just like to say, if you are tighter than most use more lube. If this is your first kegel ball, do your kegels even if the the product says that you don't have to. This is a very unique product in my mind as the other kegels balls with strings are tiny and plastic(or glass but mainly plastic) with cotton string. This is all silicone and easily cleaned.