Atomic Tweaks-heavy? I don't think so. Maybe not the lightest twin on the market, but definately light. They ski well on groomers, and relatively well in a little bit of crud, and very nicely on rails and jumps. Halfpipe took some getting used to, but thats just cause they were longer than I was used to.
I liked the scratch fs better, but the tweaks are definately a sick ski.