The casing is much lighter than the R33 ones. I use lightweight shockproof in mine with 270rwkw no probs. Also my box had 200,000+ k's on it before it got into my car.
It has a small problem which I know others have had in that when shifting fast from 4th to 5th at redline (well at any revs really) you can put it into a no mans land between 3rd and 5th gears where it crunches badly. I have had to slow my changes there cos I don't want to blow the box.
Short answer, no nothing like the getrag from the R34 GTR, very much like the R33 GTST.