I just replaced mine on monday after 130K of use (assuming the previous ownder didn't change it-218K of use).
Seems like many people have different experiences in terms of how reliable the MAF is. One thing I've noticed, aftermarket MAFs are junk and don't last long.
2008 Nissan Titan-air-raid intake, air raid TB spacer-TBI-Nismo Cat Back
96 B4 Passat Wagon TDI 5 speed-Van Aken box, neuspeed/Bilsten rears with FK front coils, ECODE head fog and Taillights