for a street driven car, that is not pulled apart on at least a semi-regular basis I would absolutely stay away from an all-aluminum flywheel, just not enough durability for a car that meets these requirements. as to a aluminum outer w/ steel inner flywheel, I would go with this over an all aluminum wheel anyday, but I would still have some reservations over using it, especially on a car where it is such a hassle to get to the flywheel, if in fact it does fail and needs to be replaced.
