I have the Moon Cup. It's silicone (because of course I had to have silicone). It was a little tricky at first, but I really like it. This is my 4th cycle with it and here are some pros and cons I've found personally
Pros
-No more buying tampons or pads which saves tons of money.
-No irritation from chemicals.
-No waste.
-Foreplay and certain sexual activities are easier without strings hanging out.
-No need to carry tampons or pads with you.
-Easy to clean.
-Comfortable.
-Very little leakage or scent.
-Less cramping.
-Safer than chemical ridden pads or tampons.
Cons
-Can be a pain in the ass to fold to put in and remove.
-Mine got crazily stuck one time because there was too much suction and it was too high so I had to actually dig it out with clamps (because I trimmed the stem)
-Gets a little messy sometimes.