Product review (5 stars): Fixed my MGR5755ADW stove!
My Maytag MGR5755ADW developed an issue where it would take a long time for the oven to start heating, then it would cycle every 20 seconds or so, relighting the gas.  Replacing the igniter with this unit fixed the problem.

The power necessary to open the gas valve in the oven runs through this igniter.  If the igniter develops a fault, it'll prevent the gas valve from opening.  The igniter doesn't need to physically break for this safety feature to be tripped...a change in the igniter's electrical resistance is enough.  I measured the electrical resistance of this part to be half that of the original igniter, which indicated that the original was likely faulty.

The replacement igniter included no instructions but is marked as being a genuine Whirlpool (who owns Maytag now) replacement part made in the US.  It cost about half of what some appliance part websites ask for it.

Replacing the igniter was very easy.  First, unplug the power cord and shut off the gas supply to the stove. Then open the oven door to its first detent and pull it straight up off the hinges.  Remove the racks inside the oven, then remove the lower panel in the oven by lifting the rear edge first.  Once done, you'll see the igniter at the back of the oven.  Put some water (NOT oil or grease) on the two screws securing the igniter to the burner...it'll help make them easier to remove.  Undo the two screws holding it to the burner, then pull the igniter forwards.  The igniter's power cord passes through some white insulation at the back...pull it out far enough for the electrical connector to be exposed, then simply unclip the connector.  Reverse this process to complete the installation.

This took me all of 10 minutes to do...anybody can realistically do this themselves.  Could not be happier with the product (quality and price) or the final outcome...my oven now works properly again!