RITAS--I used the Adapt ring a couple time, but I prefer the Eakin Seal...
They're used the same way (or, multitude of ways). I mould mine to the size I need, which is actually smaller than the way it comes, and center it on my wafer. Apply the wafer and pouch and away I go!!
Now, with that in mind, some people cut them, some apply to their skin and some just use a small portion to fill in low spots.
They don't leave the residue that the Eakin Seal does, but I get better protection from the Eakin. My stoma is small and is VERY animated when active. The seal gives me a good 4 days wear time and I am an active person who is aways outside no matter the weather! Many on here get 7 days with it.
I think either brand is easier to use than paste...no set up time...but its an individual thing! Good Luck trying them out:)