The only problem I had was that with the coatings like those is you can't get a decent measurement for piston to cylinder wall clearances
I had to replace two pistons for a friends roots blown SB Chevy that he had bought the older TRW turbo pistons without the coating 20+ yrs. ago, I couldn't buy them anymore so we ended up waiting a little over 6 months for those Speed Pro replacement pistons due to the manufacturing being moved to India and not being told the new replacement ones only came with the coating