Product review (5 stars): Appears To Be Genuine Part, Works Well.
12-5-17
I'm reviewing the Ignitor by Whirlpool part #279311 (an updated part number according to the service manual).  My original one was cylindrical shaped.

My dryer suddenly stopped heating although the drum was still spinning, so I knew I had to do some diagnosing.  I'm an automechanic by trade, but have been known to fix or even modify appliances to repair them.  Well, I first disconnected the electrical cord and began "ohming" different components that I know should not be open... such as the coils/solenoids for dryer gas valve, the ignitor, and flame sensor.  These were the easiest to get to from the base cover being removed.  I knew some components were Okay, such as door switch (otherwise drum would not be spinning), the setting switch or temp adjuster, and motor, etc.

I did not know the exact resistance specs for the coils or ignitor but as long as they had low resistance, I figured they were Ok or at least not THE failure (they also could be weak but still functioning).  The only component that was open was the Flame Sensor.  Since I was there and everything was original (over 15 yrs old), I decided to also replace the ignitor.  Amazon is my "go to" site for many appliance parts, but I do not get the cheapest, I rather go with the best reviews along with the highest seller ratings when possible.  This is just in hopes of not wasting time with returns or DOA parts. Be sure NOT touch the element end with the crystals, this will shorten the life if not cause it to fail immediately. Install the Ignitor by holding the ceramic base.

The Sensor and this Whirlpool Ignitor have now been installed and all is functioning as it should!
The gas dryer I have is Whirlpool LG7681XSW3

I bought this from the seller "Amazon LLC", which I feel is important to list this info. I've come across sellers with variances in their items, including knockoffs, even if listed as same brand. I'll post an update with a durability review.