I just blew up a racing motor with them installed but it wasn't a piston issue.
They are well made, strong as hell. They are heavier than stock, but at +3 mm bore I guess that isn't that big of an issue.
You must run high octane fuel. :!: :!: :!: That motor detonated hard enough with 100 octane to hammer the rod bearings out. We now run Sunoco 112, CAM2 Purple or VP C14/ C16 in the high compression motors. It is required. Yes it makes for a lot of power. Compression generally does produce more power.
If one is going to run an SV motor that hard, Carillo H beam rods, an upgraded grank, and precise bearing sizing/selection is required. I'd recommend ceramic coating the cylinder head chambers and moly coating of the pistons below the ring lans. Ceramic bearings and a nitride coated crank would also be a good idea. Of course the normal race motor stuff - FCR's, Big exhaust, flow ported heads, big valves, valve springs, race valve hardware, hot cams, quality cam chains and billet tensioners, billet adjustable cam sprockets, ignition, clutch, transmission upgrade, etc.
Stock parts "might" live one hour? Maybe less.
Those pistons are really race only parts.
A good set of 'Busa pistons with 2/3 of stock head gaskets is a great way to gain a little power and not over stress a stock lowerend. One can usually buy all the parts needed for than upgrade from a dealer for less than $300US