The Salsa measures about 3.25" and its circumference is around 2". That being said, it's not very suitable for vaginal or anal insertion. It doesn't get very far in (making it hard to stimulate the spots people like) and once it's in, it may be hard to get back out. The size is perfect for its function. But for those who want more stimulation of deeper parts (penetration), this may not be the toy for you.
The design of the Salsa is different from the Tango. Instead of having a lipstick head like the Tango, it has a pointed tip like a standard bullet. The tip isn't painful by any means. The Salsa is also completely seamless and plain-looking. The eye just goes over it and no one thinks twice. I've left mine out a few times. The design allows me to hold it differently without it affecting the stimulation it delivers. The toy is very easy to hide, which can also make it easy to lose, so be careful! I took mine in my carry-on on a trip and the TSA thought nothing of it, so it can travel friendly.
When it comes to partner play, the Salsa is great. My boyfriend was a bit flimsy with it at first (it was his first time holding any toy) but when he got the hang of it it made the experience a billion times more enjoyable. We did not, however, use it during intercourse. I think the added movement of us and the fact that we changed positions a bunch of times, made it not ideal for use during intercourse and it would have faded out of use fast. If you could keep it in place, it would be great for pin-point stimulation but many, including me, don't want to put up with the hassle.