I may be just unlucky with cheaper glow plugs, I have tried a few and
they just did not last like the better glow plugs. The only three that has
gone out in my year's worth of flying are the cheaper one's ... So IMO
Don't try to save the little bit on plugs!! Once you removed the thought
from your mind on Deadsticks they are pretty easy, well as long as you
are close or high enough to make it back, and or it doesn't happen just
after take-off with not enough speed to make it back:-) Enjoy....