[Jeff Lee]

There was a time when TRW pistons were affordable and there was little else to offer. Considering the cost of a new set today, those offered by CP, Ross, etc. are not only vastly superior in technology and quality, but the cost difference is negligible. Remember, ring seal and reducing friction is key to a fast engine. Both are difficult (but not impossible) with a inferior piston.
But if you have an old set laying around and just need to get it running on a tight budget, then go ahead. Have somebody prepare a high quality set of rings that are gapped, thinner with spacers and back-cut. Vertical clearance is important and can be adjusted with spacers. But you will not obtain the machining tolerance on the lands as offered by the other race piston manufacturers. Not out of the box anyways.