Has anyone used these O2 sensors before and are they any good?

They are supposed to be made by NGK so im guessing they would be.

http://www.nissanpartspro.com/shoppi...N&model=MAXIMA

yea i actually saw some on ebay for like $25each, they are made by NGK and are supposed to be pretty good, i was going to purchase but i askd the seller a few questions about it bcuz i was skeptical, but he never replied, then i posted a thread on the .org like you have concerning the NTKs but no one replied, so i just went on ahead and paid full price for the NGKs on another website; but if you go to NGK.com you will then see that NTK are made by NGK, bascially the same product but different name. I hope this somewhat helps.