Okay, so frankly, I only tried the Brava moldable barrier ring because they sent me samples, and I regret it.
I tried the barrier ring, and first off, it smelled—maybe because there was a leak around it, I don't know.
The next one, I didn't use the ring because I wasn't happy with it. I had my first real leak under the wafer that time—I think it's because I changed the adhesive attaching bag halfway through, and pulling the bag off loosened it. I should either get one piece or clicky two-piece. Adhesive two-piece isn't worth the trouble.
So I had some irritation, so I used the Cavilon spray and tried a barrier ring again. Well, I just took that one off; the seal was not good under the ring (did the spray not dry all the way? Did it keep it from sealing?), the irritation was still there, maybe even worse.
So now I used a Hollister barrier wipe and made sure it was dry, and I just went back to the wafer without the barrier ring. Why did I even try that?
Also, I'm trying a one-piece (that I got as a sample), and so far, loving it. I think I may switch to one-pieces if this works out.