Product review (3 stars): Great Price with Prime Shipping but Possible Problems with Fit and Quality
Pros:
-Least expensive unit available with Prime shipping
-1/3 the price of OEM replacement from manufacturer
-Exact fit for cutout and mounting holes in dryer
Cons:
-Dryer door needed spacer to activate switch (but easy to fix)
-Studs holding switch together just melted with soldering iron leading to questions regarding quality. See photo.
-Wires slightly shorter than on OEM unit. (but not really a problem) See photo.
Details.
Purchased for Maytag Dryer MEDX500XW0 (switch used on many makes and models). I accidentally broke the original switch while replacing the dryer's rollers and drive belt. The OEM switch is only glued together and a hard yank on the wires pulled it apart. Prime is addictive. I was willing to wait two days to save ten dollars when compared with local price.
The OEM unit has three studs in one half with matching holes in the other.  In the OEM unit the studs are only used to keep the two halves in alignment.  The switch is held together with urethane glue. On the purchased unit no glue is used.  Instead, the three stud ends are melted with a soldering iron to hold the two halves together. (see photo). It might not make any difference but one starts to question where and how this switch is put together.
This is a single pole-double throw switch, which means that in one position the switch provides power to one item, in this case the dryer's drum light. When the switch lever is pushed in by the door it disconnects the bulb and energizes the dryer's motor and push-to-start switch. On my replacement switch the lever was not bent enough for the switch to be activated when the dryer's door was closed.  The solution was relatively simple: A thin piece of adhesive backed foam or felt or even a dab of silicon sealant stuck onto the door where the lever contacts it, will solve the problem. It should just be thick enough to activate the switch as there is very little over-travel allowance for the arm.  Something with give, 1/8" to 3/8" thick should be just about right.
As mentioned, the wires on the purchased replacement were shorter than on the OEM unit.  But this should not be a problem as the  mating cable in the dryer has plenty of slack. However, do check that the wires are properly crimped to the terminals.
Final thoughts:  Based on the above lapses in quality, I am now somewhat concerned about longevity.  Not because of the few dollars the switch cost but it's failure would result in days of downtime for the dryer and would be a pain to replace. I am making the assumption that the components were sourced from the same suppliers and are identical to the parts in the OEM ans well as all the other replacement switches. In that case the switch should last for many, many years and it was a great bargain.  If the components are inferior, since even the OEM switch is maxed out by the motor's electrical demands, then switch will fail relatively quickly.  I was tempted to purchase another one just to take apart and compare it with the OEM, but in the end got frugal and lazy.  Would love to hear from people who have installed this switch a year or two ago as to how it held up in use.