Product review (5 stars): Igniter has oven working better than new.
12 year old GE Profile gas oven was having major issues heating up, taking over an hour to reach 450.  Oven symptoms included slow heat up and peak temperature at 110-130 degrees, sound of gas puffing into oven, and smell of gas.  To get oven to move beyond the 130 degree temp would require turning oven off and on multiple times.
Replaced the igniter in about 30 minutes and fired up the oven.  Heat up to 450 now takes 11 minutes, and the oven works better than when it was new.