The bosch duraterm glow plugs are definatley worth the money, they seem to last forever, I have the afterglow relay, which means approx 3 mins of glowtime each time I start the car (no matter what temp it is outside) and at over 1.5 years old, every single plug is still working great! If I glow for 5+ seconds when its below 32 and above 20 deg's, it starts on 1-2 cranks. Below 20degs, I'll give it 15-20 seconds to glow, then crank, and once again its 2-3 cranks to start. Excellent. 
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