TPS - Aftermarket or OEM

Simple enough question... OEM TPS is about $105. Aftermarket is about $55. Other than the obvious cost difference, are aftermarket ones "iffy" vs replacing it with an OEM one? Any firsthand experience out there? Thanks...

Ivan

I just did TPS yesterday on my 96. I got it at NAPA for 38 bones. By OEM do you mean Dealer? I'm not gonna pay a lot for this muffler.

Just food for thought. I needed a TPS and the only one I could find was at Autozone of all places. Been in there 3 years and no problems so far.