Lightweight crank pulleys?

[Kracka]

I came across an interesting post by ACTman on EvoM (he works for ACT) stating that Brent Rau was having issues with his flywheel bolts coming loose until he switched back to an OEM crank pulley. Also found some info basically stating that although a solid pulley won't break your engine, it will wear the bearings faster. The more power the engine makes the more issues that arise it seems.