On the whole, these are a good set of replacement tips. They come in a compact case which houses them securely.
I ordered the S/M/L in Memory foam and Green Silicone for a different type of sound.
On multiple headphones, I've tried the green earbuds give off a very bassy sound whereas the memory foam is more of a balanced signature.
The main reason for a drop in a star is the "Small" memory foam buds still don't feel that small to me, and the large feel like an extra large.
That said, the small seems to work alright in my ears. In the future, I may order a 6 pair set of Small ones - the added benefit from memory foam (despite their tendancy to pick up ear wax) makes them worth having on all my pairs of earphones.