I'm not sure what year but when the layered tips first came upon the scene, I won a layered tip in a contest or lottery. I was required to have the tip installed by their technician. I assume to be sure operator error didn't lead to a bad review.

No way would I let anyone but Roger touch my ivory ferrules, so I had a backup shaft I gave their qualified technician for a professional install. I hit 3 balls and the tip fell off!!! So much for the qualified technician. I then reattached it and gave it an open minded trial.
On my home table with my cueball it was apparent when fly specks started occasionally appearing on the cueball. Close inspection proofed it to be the glue layer.One particularly large one matched perfectly a bald spot on the cuetip glue line. This occurred in competition and I missed a critical spin shot when the glue release from my tip was felt, the shot missed and the matching speck was on whitey. I removed the tip and saw no reason to experiment further as that experiment had just cost me money.
Perhaps there are other layered tips that don't have the glue problem I experienced. I see no reason to experiment further as I am quite satisfied wih my Triangle tips now.
I used to wear out a Le Pro in approximately 6 months. It always played the best when it was almost gone. Now my tips last for years as I don't play nearly as much.

In competition I always inspect and clean the cueball before breaking. Many times I have found flyspecks on whitey mid match. At first it was a question regarding my opponents tip. It was always layered. That evolved to a statement, "you use a layered tip." Has always been affirmed in that situation.

Anyone willing to spend $35 on a tip to try to improve should spend their money on a lesson. It ain't the arrow. Duh