I use Soft Cups (which is right along that line). I really truly DO love them, but like others are saying, they're not without their own issues.
Just a warning before reading this...due to the sensitive nature of this topic, there are going to be things that totally seem like TMI. If you aren't comfortable reading about woman stuff, then don't read any further. :)
The BIGGEST pro in my opinion is that I can safely and comfortably leave the cup in for 12 hours before needing to switch it. That is ultimately the main reason why I prefer them. I am not really a pad girl, and I would have problems in the past with tampons shifting uncomfortably after going to the bathroom. I was practically to the point where I just planning on having to change the tampon any time I needed to go to the bathroom. I don't ever have that problem with the soft cups (imagine a very comfortable suction cup covering the opening of your womb...it catches all the blood and keeps the smell away).
Putting it in is a little interesting at first, but to me it is not hard at all. There are instructional videos on their website (that are not too graphic). Once it is in, you shouldn't feel it at all.
With the whole 12 hour thing, you need to know that I would NEVER plan on having to change it in a public restroom. That's NOT ever going to be a reasonable change-out place. Imagine gently hooking your finger over one edge to break the slight suction, then pulling out a small cup full of blood...It's going to get some blood on your hands. My bathroom sink is right next to our toilet, so I rinse my hand off right away. In a public restroom that is generally not the case. You don't want to walk out of the stall with blood on your hands.
Back to the smell of things...while it is in, you will not smell any of that yucky period smell, BUT when it comes out, there is going to be some blood that gets left behind inside of you, and thus, you will smell it. If you shower in the morning, then it is easiest to put it in either right before or right after your shower. Make sure to kind of wash things down there to get any excess blood out of the way, and you will smell fresh all day. When you switch the cup 12 hours later, you'll probably be getting ready for bed soon, and who cares if it smells a little (let's face it, some smell would be there with a pad or tampon). In the morning, when you shower again, you'll be all fresh for the next day.
Side note: many of my posts have indicated that I am a teacher...the soft cup has been a GODSEND for me in my job. I don't have time to run to the bathroom all throughout the day, and when I do, it's always interesting trying to find a place to temporarily hide the tampon in my dress clothes while walking all the way down the hall to the nearest bathroom. I LOVE not having to mess with any of that!