The result of the debate was something like this:
- They make a real improvement in percieved smoothness at high revs
- They probably cost a tiny bit of power - it's negligible.
- They don't save the engine or reduce wear by any real amount.
Conclusion: it's just a NVH mod. The driver may be happier, but the engine isn't really any better off.
Don't start this argument again if you don't agree with me: go read all the old posts. (Not to anyone in particular, just sayin'.)
