Product review (5 stars): Working fine so far on my Viking oven VGIC3054BSS
My Viking oven is model VGIC3054BSS.

The oven burner on the right (facing the oven) would sometimes not light or partially light.  It sounded like wind blowing down a pipe.  The igniter would always glow it just wasn't getting hot enough to release the safety valve and allow the gas to enter.

There are two differences between the original Viking and these generic igniters.  The glow bar on the Viking is flat whereas the generic is rounded.  Second, the white base of the igniter where the glow bar comes out of is longer on the generic.  it sticks out about an inch past the metal frame.  This did not affect getting the igniter into place.  There is nothing immediately behind where you screw the igniter into place that will restrict the generic one.

I did not remove my door only because I couldn't get the darn thing off.

Unscrewing the screws that hold the bottom base plate on was a little tricky because the space between the bottom of the door and base plate is very small.  A long neck screwdriver would have been useful.

Unscrewing the old igniter from the pipe was easy, but I did use a socket wrench and not a screw driver.

Disconnecting the two wires took a little patience.  I had to wiggle them back and forth and up and down.  They didn't just slide out with one pull.

The new igniter screwed into the pipe and connected to the wires just fine.

Discounting all the second guessing on my part the actual work was 30-45 minutes.  After turning the power back on the stove lite up nicely (hopefully it will stay that way).  I noticed a little bit of the smell other people have mentioned, but it was minor and went away quite quickly.

Lastly, I did not replace both igniters.  I thought about it, but the other igniter has worked consistently, so I figured leave it be for now.