Yes, 7.6kg is the weight of the standard one I had lying around in my garage. Not sure how much my lightened one weighs. I normally weigh stuff like this to satisfy my curiosity but it was a last minute job before the RBRR so I was in a bit of a hurry and just threw it in. As far as the benefits go, the effect is quite subtle, the car picks up revs quicker. They die off quicker too but I haven't found that to be problematic in the slightest. Worth fitting if you've got the engine out but I'm not sure the performance increase would have been worth the time, money and hassle if I'd had to remove the engine specifically to fit it. I think that, if you managed to lighten the standard flywheel to the point where it effected the idle, setting the idle rpm would be the least of your worries!