I have been running one for over 7 years at or near the 700hp level. I like the quicker rev, and I'm hoping the lighter weight helps the stock block last. I had the motor apart to lower the compression and address some valve train instability issues I was having, and there was zero signs of cap walk. I do run a Hughes girdle on the thing.
My Ross pistons weigh in at 524 grams with pin. Not sure what the bob weight is with the 7.1" Chevy journal rods, but the thing spins up in an instant.