Product review (3 stars): Works, good price, but buy one before you need it
This works as expected and the price is great compared to the local hardware store, but I knocked off a star for the short service life - this is the 3rd replacement (4th total) in ~12 years.

Its also energy intensive, roughly 400W (3.2 - 3.6A) the entire time the oven burner is on (vs spark ignition that might spike 50W for a few seconds). That's especially problematic if you ever have a power outage and need to run the oven off a 12V transducer, with an extension cord (unfortunately mine is only 300W max, discovered the oven needed more than that the hard way). Its also problematic for anyone running on solar with batteries, or a smaller generator that'll brown out if the oven burner and fridge compressor are on at the same time. I think its more a fault in the oven model design than the oven ignitor itself, really there is no reason it couldn't use a pilot lite for the oven "session" (from when a temperature is set until its turned off), so the glow plug is only on for a few minutes. I will never get a stove with this glow plug mechanism again, but its not bad enough to replace the oven early.

Tip: Recognize the signs of glow plug failure and buy a replacement ignitor before you need it. Check for a slight decrease in glow plug brightness over time (from bright yellow to yellow-orange to dull orange), increasingly longer burner ignition delays despite the plug glowing (dully), along with difficulty maintaining temperature, and maybe small spot discoloration in the glow plug element (when cold) at what will become the point of failure when it burns out. Its hard to guesstimate, but when those issues start to become noticeable expect ignitor failure within a couple months of regular (daily) use, though a dull orange glow with failure to maintain temp is probably closer to a week left.

Another Tip: RTFM, really, read the service manual, its not long nor particularly complicated, but there are some non-obvious quirks, and some differences between oven models that use these ignitors. Google your oven make, model, and "service manual PDF".

UPDATE 8/3/17: 4th ignitor service life from a few days after last order on september 18, 2015 for $23.81 until august 3, 2017, -1 star for poor quality. Checked alternatives, none look better, ordered another replacement, for $25.50. This failure was unexpected, most of the heating element looks fine but there's a grey-white spot with slight deformation, there was no noticeable decrease in brightness or temperature control. Tried to stick a multimeter probe in there to pick up line voltage but only managed to break the element, did register line voltage at the plug (there's a tiny chance its not the element).