I think these are currently the best piston for the money. I also like that they sell just the stainless nitrided top ring instead of having to having to buy the entire ring pack. Works out to be about $100 cheaper that way.
FWIW if you can find somebody with an Atech (Summit Wholesale) account the piston set will be about $100 less expensive (in my experience).
I searched the part number on googke and found s place that had them for $654, backorder but suggested they eould ship in a few weeks. Took a chance coz the price wss good. Emailed a week later to ask about tracking and such. They said they should ship on the 24th. They showed up today. Glad that worked out!!