If you mean the NPR pistons, I didn't like them at all.
I had two sets (8 pistons) of NPR pistons, and the piston pins didn't move "freely" in any of them. Sure, I didn't have to use force for the pins to get through the pistons, but it didn't glide freely through the piston either (could get stuck). Because of that I didn't feel comfortable with using NPR pistons in my engine, so I decided to use the OEM pistons since the pins had a much better feel in the OEM pistons!
So, in my experience the NPR are cheap copied junk of the OEM ones. Some people had great success with NPR pistons, but I personally wouldn't risk a rebuilt engine based on my experience.
People on different boards say that NPR and OEM pistons probably are made by the same company, but the only similarity they share is that they have the same design. They don't have the same coatings on the tops (different colors, don't know if that means anything performance wise) and the lower part of the OEM pistons also have some kind of light grey coating, which the NPR pistons don't have. Also, the piston pins provided with the NPR pistons are thinner than the pins provided with the OEM pistons.
My advice, do it right from the start. Pending on you power goals and/or use of your car I would run OEM pistons from Mitsubishi, or a known forged brand if you aim for higher power goals.